yoggibeer

1972 Olds 350 engine backfires when startup, it will idle fine and drive ok, but once i put a load on the engine it begans to sputter and backfire. I replaced the wires, plugs, cap/rot, coil, points , condenser, and check the timing. Then, i replaced the points and condenser with a cramcam s converison kit. Now it will idle fine again but i still get a backfire exhaust and sometimes through the carb.