why did my 2003 pontiac grand prix backfire when i try to start it

Asked by adamr420 Nov 02, 2013 at 01:39 AM about the 2003 Pontiac Grand Prix GT

Question type: Maintenance & Repair

2 Answers

adamr420 answered 10 years ago

just replaced upper n lower intake manifold gaskets wires plugs coil packs intake manifold

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John answered 10 years ago

Extremely lean caused by new manifold gaskets leaking unmetered air or the spark plug wires are not going to the correct plugs.

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