I have a 1979 Trans AM next to a '76 400, a Th400, 750 Holley carb, all unsullied spark plugs and wires, and a new distributer. Can't digit out why it backfires when I climb into 3rd gear roughly speaking 3 or 4 times then clears out. Just started up about 2 weeks ago. Could it enjoy something to do with my harmonic balancer need to be replaced?
Answers: Could be the beginnings of a worn camshaft. (had a 78 Camaro did this) Also could be carburation. Does it backfire through the exhaust or up through the carb? If through the exhaust its too much fuel going out the exhaust unburned. If its back up the carb its usually running lean. Sticky valve, worn cam, sticky linkage on the carb. Good hunting.
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