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    90 gmc k1500 5.7 tbi backfire problems

    I have a 1990 gmc k1500 5.7 tbi. I had the engine rebuilt, bored .040 over and mid range cam installed. I have replaced every item that touches the engine already. Map, IAC, TPS, rebuilt the TBI, EGR system, Fuel tank, fuel pump, fuel lines. I sent this truck in once to a mechanic already to fix...
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