Question about 1999 Pontiac Firebird

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1999 Pontiac Firebird multiple misfire

Pulling p300 code. Changed plugs, wires, coils, injectors, and lifters. Still pulling misfire under load. What could cause this?

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It could be a clogged fuel filter, bad gas. Or if you have done alot of modifications to it, the injectors may not be able to keep up.

Posted on Apr 21, 2009

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1 Answer

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I hope you used all factory parts, it makes a difference. Compression test? nope valve guides I really doubt it
have someone do a smoke test for vacuum leaks you can have a sucked intake manifold gasket smoke test is really the only way to find a small vacuum leak
contact me at fixincars@yahoo.com with any questions and feedback please
Thank you, Randy
Do we know for sure that the PCM (computer) is actually firing all the injectors? you need a
NOID LIGHT for this test

Sep 17, 2008 | 1999 Pontiac Firebird

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