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I would have the timing checked on it

if it's backfiring and idling rough i'd have your guel pump checked out especially if it's back firing cause that wouldtell me my car wasn't getting enough fuel

could be a bent valve or push rod went threw rocker arm i see it all the time

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Q: What causes a 1991 Chevy Camaro to backfire and idle rough when the spark plugs and wires and distributer cap and rotor were replaced fuel injection was cleaned gas is new and firing order is correct?
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