I have a 1971 Chevy Impala with a 350. The exhaust manifold has been replaced with headers and a dual exhaust system (no crossover pipe), and the original carb has been replaced with an Edelbrock 750cfm 4bbl. It has plugs and wires that are about 3 years old.
The engine runs poorly and does not produce very much power. When I try to accelerate from a stop it bogs down and nearly stalls unless I give it lots of gas. Often it will backfire through the carb shortly after it has been started, the air cleaner is black with soot. After this happens it runs a little better for a while.
I've tried adjusting the accelerator pump on the carb to provide more or less fuel, this does not appear to help. I've adjusted the set screws on the front of the carb which also does not seem to help. I've adjusted the timing in the past, but have not checked it recently. I've checked that the plug wires all go to the right cylinders and cleaned the plugs.
2006-12-22
02:55:04
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20 answers
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asked by
codesuidae
1