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  1. Ty1er

    Vortec 350 Cylinder 4 Misfire

    I have a 97 K1500 with the 5.7 vortec, over the course of a month or two I noticed my mpg steadily declining but no performance issues...I replaced the plugs and wires, cap/rotor, took the K&N that the PO off and put factory air box back, replaced MAF, and fuel filter all over the course of a...
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