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#chevymisfire

  1. W

    Silverado cylinder 8 misfire no codes no fix

    This one's got me scratching my head. 2012 Silverado 4.8 flex, cylinder 8 misfire started right after seafoaming the intake. No codes, no vacuum leaks, compression and leak-down tests check out. Swapped injectors, coils, plugs, wires, O2 sensor. Misfire stayed. Fuel pressure is fine, even...
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