GMC Sierra C1500 4.3L Vortec cylinder 5 misfiring - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-04-2013, 11:35 AM   #11
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hard to tell, the pressure regulator is internal(in the intake manifold) on that one so any vacuum leak could cause fuel pressure issues, which can cause misfires. but the compression is an issue you have one that is out of spec. all you can do is fix it and see
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