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    96 454 Vortec complete rebuild - unknown misfire?

    Do you know if you have a rich misfire? at idle? I am having a similar misfire problem, although I have a 1995 GMC K3500 w 454. Yours is OBD2 mine is OBD1 but I think some of the potential misfire causes could be the same. The MAP sensor and ECT sensor are likely candidates for causing a...
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