ROLAND ... 5/8/2011
1990 Pontiac Tempest Base 6 Cyl 3.1L
Gentlemen, my sparkplugs burn black like charcoal, and engine misfires while in park
Gentlemen , my sparkplugs burn black like charcoal, and eventhou the engine runs, rev, and pick-up good, still it happens to misfire while in park. I have changed sparkplugs and wires, motor oil and filter. Also added fuel injector cleaner to gas.What could possibly be wrong?
Bad fuel pressure regulator, fuel pump pressure too high, Bad air filter, bad O2 sensors, bad temp sensor or mass air flow not reading.