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Im tryin to tune the 305 in my 84 caddy , but i cant seem to stop it from backfiring through the carb.Ive changed the plugs, wires, cap and rotor .Why is it doing this? Could it be the timing [I never changed it from where it was when i swaped it out of the MC] or maybe its the carb? The engine also seems to run fast at idle.How do I adjust the idle, if it is the carb?