Ok, so i just switched my 750 vac sec. to a 650 double pumper.(I was told that my carb was to big) Im not real good with carbs and vacuum/timing stuff at all. So anyways, I slapped the carb on, but i seem to have idling problems.I can set the idle on the carb to run at 800rpms and it will fluctaute (very minor) but when i put the car in gear, the rpm drops to like 200 rpm killing the car.If i set the rpm for 1150, and i put it in gear it puts me at about 450 rpm and just barely keeps running (Real rough) What seems to be the problem here, anyone? Damn i need to take a mechanics class to be running this beast.Thanks in advance.

~~Jaime~~

 

Sounds like you need to set your air/fuel mixture.The little screws on the side of the metering blocks will adjust this.The best way to do it it with a vaccum gauge hooked to the carb,adjust the air/fuel screw until you get the best vaccum reading then move to the next air/fuel screw.If you don't have a vaccum gauge you can do it by ear and get it close by listening to the speed of the motor.After you get the air/fuel set readjust your idle.

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Superman
Rev'n to Seven

 

What is your timing set at?

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter

 

Thanks Superman, Thats all it turned out to be.(air/fuel mixture) Shes runnin like a champ now.Thanks all

~~Jaime~~

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1987 TransAm
350 sbc
Holley 750 Vac sec
Edelbrock Performer Rpm Heads/Intake/Cam
Flowtech Ceramic Headers
Crane Roller tip Rockers/pushrods
Flowmaster Muffler

 

No problem,glad it got ya fixed.