Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Makes a poping or pinging sound not a real loud backfire. How to test the accelerator pump while on the bench. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Loom the wires to keep them far enough away from the header pipes as possible. I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. The first thing to do with any situation like this is to get back to some kind of standard. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. I'm running a 1411 carb on top of a Performer intake and stock internals. Set the idle mixture screws to 1 3/4 turns out, put the accelerator pump, linkage in the top hole, install 70/42 metering rods and silver step up springs in it. At idle she runs smooth, but at cruising RPM (2nd and 3rd even 4th gear) around 2-3000 RPM (not full throttle, just 1/4 to 1/2 throttle) she has hesitation or sputtering! While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. Well, I am still running a carb plate and phenolic .5" spacer. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. other then the instant start-up idle weirdness it idles just fine. If it is, it can cause all sorts of problems. Also make sure you floats are set correctly while youre in there. 1970 440 stock manifold with edelbrock performer 1407 carb. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. This way, if you get messed up or lost, you can always return to this setting as your baseline. Hesitation on hard acceleration. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. Each of the four . Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. I changed it to the 0.33" one from the 0.28" that was in it. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. Email any other details needed. you overlooked the holley! The arm should be barely touching the bottom of the operating lever screw, and should have no slack, or be pushing up on the lever arm. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. This paragraph also applies to relatively stock engines with the original carburetor. elcamino65Memberfrom washington. Terrible stumble off the hit . As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. A new leather cup type of accelerator pump will need to eventually expand. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. Maybe ground on 'em or filed 'em? I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. Even if I'm driving at 20 MPH and open the throttle all the way very quick. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Is it a V1 or V2 system? If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. I understand that I can unsubscribe at any time. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. The accelerator pump function, as mentioned . Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. The Fora platform includes forum software by XenForo. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. The small holes may be plugged. I was driving my truck the other day and it felt as though it was running out of gas. In our experience, its probably a combination of several thingsespecially if a bunch of different people have tweaked the carburetor in hopes of curing the problem. This test is best done with the carburetor off of the car. That's the very reason I switched. Most noticeable in the street avenger series. #3. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. vibe app for android ; 128px by 40px gif; metricon. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Brand new Edelbrock AVS2 series 650cfm carb. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Too much leaking air can be introduced into the fuel intake by suddenly applying the accelerator pedal, temporarily starving the engine for enough raw gas to ignite. Push the pump down and watch it squirt gas out of the main discharge. If you cover the carb and it revs up, you have a vacuum leak somewhere. My temp has been 185-190 consistently at idle and on the road. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. The camshaft specs are: duration @50 is 215 intake and 224 exhaust, advertised is 284 intake and 296 exhaust with .470 intake lift and .490 exhaust lift, with 1.6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel squirting across the venturi. And that is measured at wide open throttle using a feeler gauge. No, as in driving the car on the street. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. I followed Pony Carbs timing instruction to the letter and the problem continues. Edelbrock 1468 . Options. sggoat, ErikinSC and Solace in Solitude. After re-reading your initial post, I believe you need a bigger carb. 2. Was wondering if anyone has any ideas on what could be causing this. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. bikingplumber. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Next test is to see if the discharge check is working. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! glad to hear you got it going! Have been thru the normal diagnostics - timing is 24 degrees . But I was having problems on a hot start. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. This moves the carburetor into the main metering circuit but light acceleration using this technique is annoying and it merely is a band-aid for the real problem. . I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. Usually a stumble like your describing is a lean stumble . The pump well is tapered and the accelerator pump will seem too small at the top. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. . I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Its a Edelbrock 1406 model. More than likely there is dirt somewhere. Start by increasing the fuel nozzle size up by three sizes. I like the sound of bumping the timing. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. Jeff, this is a great write-up. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. Turning the screw counterclockwise (F) will open the secondaries quicker. If they are way off, thats good. For a better experience, please enable JavaScript in your browser before proceeding. Has anyone dinked with the secondary tip-in weights? Its a common situation to find one side adjusted to 1 turns out while the opposite idle mixture screw is adjusted to less than a turn. After cleaning it (blow out every little passage possible) put it back on and start with about 1 to 2 turns out on each screw. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. If your secondaries are opening . Do Not Sell or Share My Personal Information. I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. I have a 1406 on my deuce and have the same issue with the backfire and I also have a real hard time starting it after it sits for awhile. Dec 14, 2001. Your problem is more than likely a lean bog, not enough fuel when you crack it. I would think in the area of 650-700 cfm might work better. . Eventually the deterioration will reach the point that the vacuum advance no longer adjusts the timing, causing the vehicle to hesitate when the engine attempts to move the vehicle's weight. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Now for where I have stuff set at: fuel: 6psi. Then counter-clockwise until the vacuum comes back up. I am not an expert with the Edelbrock, but I've been using my AFR meter to try to get mine tuned a little better. How to test the accelerator pump while on the bench. The motor is a stock sbc 350 with a stock cam, headers and new intake. I've read this before when searching but no one says. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . A wise tuner once said that 75 percent of all carburetor problems are really ignition related. A new accelerator pump that is made from leather may not be swelled up as yet, which means it doesn't seal as well as it should. Your email address will not be published. Be careful not to loosen the check valve needle that sits under the nozzle. "Do you know how whipped an engine has to be to blow that loud? Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. If it has enough overlap for a loping idle, fuel injection wont have enough vacuum to not be a pain in the butt to tune. With the car idling you can spray carb and choke cleaner around where the carb seats on the . Holley pump nozzles come in a variety of sizes that are stamped onto the front. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. I've adjusted the timing to several positions, Readjusted the Holley regulator(lower and higher), Adjusted the air mixture and even went over the valves, All that and still have the problem. Then drop the idle speed to where you want it to idle in RPM and . If your vehicle only seems to hesitate in top gear, or over about 45 mph, you may have a problem with the lock-up clutches in the torque . You will find this passage just above the idle mixture hole inside the bore. Increasing the idle jets in the metering block solves this issue. Home . The ball will most likely come out. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Am using the stock 1978 ignition system. JavaScript is disabled. Good job. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Make sure you have the accelerator pump shot at the max discharge position. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. (Image/Holley). Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. Do you think I would benefit from the regulator? Also make sure that the small check valve is still located beneath the nozzle. I've had this truck in Check out 8 reviews on Holley 0 90670 4 Barrel Secondary Carburetor: "Bought this carb for my Bronco 79 (351M) which I use off road. Motor pulls clean to 6K, haven't tried taking it higher. Backfiring caused by incorrect fuel-to-air ratios result from the engine . What would you suggest? Eldon, Missouri 65026 . Thanks so much for the reply. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. Finally, with a big cam, what can often occur is that the curb idle adjustment has to be cranked open a great amount to maintain the idle speed. Privacy Policy. And, you probably you dont even need a new carburetor. I have some ideas, either the carb (edelbrock 650cfm) is screwing . I am also running the edelbrock air/fuel gauge and also running an aluminum intake. It only happens when it's warm. Also when I hit the gas real fast to rev the motor it sputters really bad. $385.95. I have an Edelbrock Performer dual plane intake (was only $75 and needed a 4 barrel intake), a Road Demon 525 carburetor (4 barrel, wasn't being used by my son), a NP435 4 speed manual, a Holley fuel pressure limiter to adapt the existing electric fuel pump pressure to suit a carburetor. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. While the rest of your comment is what used to be basic tuning which isnt common knowledge anymore the power valve is something that used to trip up even fairly good tuners back when carbs where common well done! They indicated that a 1405 would be a better match, If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Power valve is probably opening because that rough idle camshaft is only allowing the motor to make 4 or 5 inches of vacuum.if thats the case try a 3.5 valve if your gauge is showing 4, 4.5 if 5 on the gauge etc..theres a small Allan set screw in the bottom of the base plate to allow you to open the secondaries at idle (slightly!) Prior to that had the Carter which i simply couldn't get tuned properly. Stay up to date with the latest releases, events, promotions and more. I just didn't know If the cheap one was a good idea. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. Comp Cam -4 hydraulic flat tappet. The Fora platform includes forum software by XenForo. Another thing, get a vacuum guage to tune your mixture screws with. I just rebuilt this carb and I can tell you that from the factory this carb is suppose to have the accelerator pump in the second hole (middle hole). Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? Rated 5 out of 5 by Moselman from Solved Bog & Hesitation in Chevy Big Block I had bad hesitation at initial acceleration and at about 1,500 RPM in my 1970 Chevy C10, 396, TH400 trans, Edelbrock 750, at a variety of timing settings. Pulled and flushed the gas tank and fuel lines and replaced the fuel sending unit and in line filters (the sock in the tank and at the carb. Also when I hit the gas real fast to rev the motor it sputters really bad. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. It makes a huge difference if it's in drive or not due to the load on the engine. Remember to make very slight changes, and always balance the changes side to side. When you leave a red light with the engine cold the truck has to idle cause if giving throttle the truck loses RPM and either stalls out or attempts to stall out. Any part-throttle stab is smooth. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. Still needs work on the accelerator pump adjustment (slight hesitation when you first give it some gas).. Edelbrock carbs are just Carters, which are a lot like the Quadrajets. Also don't discount the discharge cover. Use something besides gasoline, which of course is explosive. 1; 2 . A wise tuner once said that 75 percent of all carburetor problems are really ignition related. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Installed a new 1406 on my 63 Avanti. Some AFB's, or Weber Marine use a check ball and a spring. Other then the slight stumble, the carb runs great. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. Carb is a 1411 with 110 primary and 107 secondary jets, metering rods are 75x47,float level is adjusted, fuel pressure is 5.5 and timing is 36 @ 3000. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. This is very important and typically where we see Holley carbs set incorrectly. The carburetor is a Holley 750 with vacuum secondary. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. Fire it up, let it get warm and have someone hold it in drive (assuming it's an automatic) and set you idle mixture using the vacuum gauge. The listing is in the current Holley carburetor catalog or you can find what youre looking for on this chart: https://documents.holley.com/techlibrary_carb_numerical_listing.pdf. May 22, 2010. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. You should be able to watch it on the tablet. That makes good sense. Thats what causes the bogging and poor throttle response. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. One question I have is I have a Holley 110? Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips Gently tap on the check ball so that the trough forms to the check ball. The weirdest thing has just happened. Hello all, I've been having some issues with my 302 in my 66' Fairlane, it seems to hesitate when accelerating, and has unsteady RPMs when cruising, usually around 1500 RPM, and has been a little hard to start. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. Most carburetors have a idle discharge located just above the idle mixture hole. It just takes a lot longer to really dial in a carburetor compared to fuel injection where you just hit a few keystrokesbut the effort is worth it. I'd put a regulator on there anyway just to make sure thats not an issue. Easy to experiment. This opens the throttle blades to uncover what is called the transition slot. posted 09-08-2005 04:44 PM. Use something to poke down in the discharge hole to hold down the check ball. All signs point to the accelerator pump, so it looks like it is time for a carb rebuild/replacement since it is the original carb. Turn the screw clockwise (S) will slow the opening rate. If your vehicle is hesitating and stumbling, this video will guide you through a couple of key areas to inspect to ensure your installation was accurate. Well without knowing the op's whole here goes. There may be a check ball with a small check weight above it. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. The distributor weights / springs are clean and tight. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. We just need to run you through eliminating the problem area. Someone said I might need to advance the timing . I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. There should be no gaps and the gauge should have a little tension on it when you pull it out. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. New edelbrock carb bogs & surges at wot. It shouldn't take much to pump the fluid through the passage. Like the Rochester Q jets. And i put a 1470 accelerator pump in . Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. This page was generated at 01:20 PM. PLEASE SEND HELP! This will make the leather too spongy and will probably fail. I should check the jets now too. Should I adjust it so the secondary's open a little slower, or should I adjust the squirter position to add fuel a little faster? Terms of Service. Thats what causes the bogging and poor throttle response. At normal cruising no backfiring. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? Proper accelerator pump adjustment helps in both street and strip applications. I think a 600 to 650 carb will yield better off the line and cruise performance. If it doesnt, the linkage needs to be adjusted. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. 70 F250 Camper Spcl. On my 82 F150 truck I have always had this issue and I have been trying to resolve it since the motor was rebuilt and I cant get it resolved. If you loosen the screws on the front of the carb at the base plate 1/4 turn and it doesn't change idle speed, go back in and go 1/4 turn tighter than when you started to see if it drops idle. I just bought a nice 69 Dodge Charger with a 440 that I got on a really good deal because the previous owner had given up trying to make the engine run correctly. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. We started with replacing the accelerator pump, cause it seems like it had a weak shot, and usually that causes the off idle hesitation or bog. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. Add a quicker Accelerator pump shot first. The Carburetor Shop LLC. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. This allows maximum fuel to flow through the nozzle. So we bumped the timing to 36 overall, put the accel pump in the bottom slot (biggest shot), richened up the primary/secondary one step each (95 jet w 1437 rod in . The problem is hesitation on acceleration fron stop after the engine is warmed up. Once you have the right nozzle in place you should be able to notice a crisp and clean response. You dont want to deliver too much fuel too soon, or to little fuel too late. If it revs you have a vacuum leak. Initial is like 20, advance all in right at 3000 w 36 deg. do koalas have poisonous claws. There may be a restriction in the passage. Report back. make sure it has only enough stroke to not bottom out at WOT. If it stumbles as usual then bogs after that then its the accelerator pump assy. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. A forum community dedicated to hot rod owners and enthusiasts. We will discuss two types of bog: the . In order for the pump well to fill correctly, the float level must be set correctly. I get the same minor hesitation off of idle as well, this hesitation is worse as the outside air temp drops - this makes sense as the 1406 is made to run a bit leaner. Jun 11, 2009. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. Any part-throttle stab is smooth. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. The overall objective is to deliver the right amount of fuel. As far as carb size goes, there is a formula that will get close. 204 East 15 th Street. #12. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. Posted: Jun 2, 2020. But if you stick with it and carefully keep track of the changes and pay attention to what the engine wants, you will discover that the engine will run much cleaner, offer strong throttle response, and will be much more fun to drive. William See all 12 photos. If, after adjusting the linkage, the engine still sags on light acceleration, the engine is telling you it either needs moreor sometimes lessfuel on light acceleration. Changing the rods and springs are very easy. 09-02-2016, 02:43 PM. Warm the engine to operating temperature. You dont want to deliver too much fuel too soon, or to little fuel too late. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. It may not display this or other websites correctly. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. I reset my timing, insulated some fuel line and it has been running great. Starts right up even after hot start. I have a 383 stroker, 9.5:1 comp, Edelbrock Etec 170 heads, 234/238 @ .050" and .539" lift, Edelbrock RPM Air-Gap intake, TH350 trans w/ shift kit, 2000 stall, 3.73 gears, in my 1972 Nova. The purpose of the accelerator pump . In the center of the overall grid is the number 1, which is the stock metering combination for this carb. It may have been changed to a larger one, which is often the wrong move. Let us know what happens. Be patient, you'll get through it. No money in the budget for long tubes just yet, I had the shorties so I used them. Learn how your comment data is processed. Osoyoos, B.C. But I still had a bog at about 1/4 to 1/2 throttle. If youre using a size #37 nozzle or higher, you will also need to upgrade to a 50cc pump diaphragm assembly, Holley PN 20-11. This will be our starting point. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. 1970 - Time for New Sheet Metal and an RS Conversion Kit. You must check this with the vacuum advance disconnected. Now he serves as a regular contributor to OnAllCylinders. What is the AFR Correction at idle and at cruise? Truck feels way peppier and "fatter" in the throttle now. Narrow band only tells rich or lean, bit not how much. Accelerator pump nozzles come in a variety of sizes. Insert the accelerator pump and push it to the bottom. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. See if that makes an improvement. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. ago. This tunnel ram is set up with a pair of 0 . Hello, I have kit #35770 installed on a 383 Stroker engine. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. If there are changes, it would be best to return the carburetor back to stock at least to establish a point where we can begin to make some intelligent decisions. This is an involved process that is too long to discuss here. When I first start the engine it runs great, and idels in great. off idle under load it stumbles when you press on the gas. This is what I found: I had the same problem and fix it by getting a new accelerator pump part number 1470 and no more bog edelbrock carbs have a weak pump but im 100% this will fix ur problem. The hole closest to the pivot point on the plunger lever is that setting.

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