Alright, when im at a dead stop and kick er in the ass, she picks up good until about 4500rpm, starts coughing and poping through exhaust....If I let up a tad on the gas, power comes right back. Im guessing too rich???right?? Edelbrock 750 on the 350. (Check my sig;) Now, how in the world do I adjust the overall mixture....the only settings on the carb are the Idle Mix screws...My friends tellin me on the edlebrocks, you need to change the metering Rods or something??WTF is he talkin bout??? How exactly do I do this...and do I have to take the carb apart??

Oh...one other thing...SOMETIMES...when shes hot, If I stomp it off a light, Itll cut for about half a sec, then pick up...Adjust the acc. pump????

With the bog at a light, I'd say its lean, and at 4500 running out of fuel, let off, fuel pump catches up then you're off again. Yes the top has to come off the carb to change jets in an Edelbrock carb, you can change metering rods without much trouble. Go Holley :thumbsup:

WOW..Lean?? With stock heads and cam...a 750 Manual sec. running LEAN on a 350...wow...glad I asked man...never would have thought that..lol It always sounded like I was flooding her out...but I guess Ill run her up richer a notch and see what happens. Any other Ideas??? Please guys...Im all ears!!!

I would agree that you may be running out of fuel if your breaking up at 4500 RPM. Check your fuel pressure at speed, you should still see 4-5 psi. You may also want to check your float height to ensure sufficient volume in the fuel bowls.

The jets in an Eddelbrock are in the bottom of the carb fuel bowls. Get at them by removing the top of the carb. There are jets for both primary and secondary. The rods are under little overs on top of the carb held down by a small scree. To richen your primaries, what you change depends on the combination of rods and jets you currently have. You may be able to richen one step with just a rod change, which takes about 2 minutes to do and the carb doesn't have to come apart. Or you may need to change jets, or both. The Edelbrock owners manual has charts that show you the rod and jet combinations to richen/lean your carb in 4% increments. Unlike a Holley, you really need this chart. Get it off their web site. To the good, a lot of tuning can be done with the rods.

The secondaries have no rods, jets only. If your fuel pressure and level check out okay, you are probably looking at richening the secondaries.

Off the line, a hesitation or bog can be adjusted by either the accelerator pump or the step-up springs -- which are the springs that move the rods up/down in relation to engine vacuum. Typically, tune the springs first and the accelerator pump second. The squirter size tunes the volume of the pump shot. The accelerator pump arm position tunes the rate of delivery.

I would agree that you may be running out of fuel if your breaking up at 4500 RPM. Check your fuel pressure at speed, you should still see 4-5 psi. You may also want to check your float height to ensure sufficient volume in the fuel bowls.

The jets in an Eddelbrock are in the bottom of the carb fuel bowls. Get at them by removing the top of the carb. There are jets for both primary and secondary. The rods are under little overs on top of the carb held down by a small scree. To richen your primaries, what you change depends on the combination of rods and jets you currently have. You may be able to richen one step with just a rod change, which takes about 2 minutes to do and the carb doesn't have to come apart. Or you may need to change jets, or both. The Edelbrock owners manual has charts that show you the rod and jet combinations to richen/lean your carb in 4% increments. Unlike a Holley, you really need this chart. Get it off their web site. To the good, a lot of tuning can be done with the rods.

The secondaries have no rods, jets only. If your fuel pressure and level check out okay, you are probably looking at richening the secondaries.

Off the line, a hesitation or bog can be adjusted by either the accelerator pump or the step-up springs -- which are the springs that move the rods up/down in relation to engine vacuum. Typically, tune the springs first and the accelerator pump second. The squirter size tunes the volume of the pump shot. The accelerator pump arm position tunes the rate of delivery.

Alright...thanks for the help!!! Also, Not sure if this plays a roll in it, but if I turn really fast around a corner, or lock up the breaks and stop fast, the engine cuts for a sec. Also, Brand new fuel pump...I did think that might be the prob, but changed it, and nothing...so I guess I'll go richer. Thanks again guys!!

Have you pulled the plugs to see what they look like? That can help determine if you are running rich or lean....

well see, theres another problem...she gets oil all over the plugs, so its kinda hard to get a good indication...Oh well...BB Coming soon enough;)

Definitely check your float height -- this is the first adjustment before other tuning. It sounds like your fuel level is too low. I've seen it before where a quick turn, brake, or even rail road tracks will cause hesitation or stall.

Get the fuel level right first, that could improve or resolve both your off-idle stumble and your high speed problem.

Off the top of my head, I believe the measurement between the float and the carb top is 7/16" measured when the top is inverted. A drill bit is a good gauge. Adjustment is made by bending the float arm. Check the Eddelbrock manual to be sure of the spec though (I can't find mine at the moment or I'd check for you).

Also check your fuel filter. I had similar symptoms in my car a year ago, right after I installed my edelbrock fuel pump. so I called summit racing to complain. The tech guy said check the filter and hot damn he was right. I would'nt have thought it was the fuel filter because it had only been on the car a couple years, but it was filthy. luckily I have the type of filter you can clean and reuse.

Good point, I should not have missed that!

New Fuel filter...hehe, Thought the same thing....this is all why I thought Maybe she is rich...but who knows...Ill check the float level, then go from there I guess

I had the same problem and it drove me nuts chasing it. The sock on my sending unit pick-up in the gas tank was clogged. May be worth looking into. Also check for cracks in your rubber hoses near the gas tank while you're back there.