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Replaced plugs wires coils and throttle body. Tailpipe shaking bad. Cleaned MAF check engine light wont stay off. Used injector cleaner and high test gas from shell. What now?
Vehicle: 2008 pontiac grand prix 3.8

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HI there

Next step is to check the fuel pressure and check for vacuum leaks on the intake manifold. If nothing is found to be wrong, do a compression test on the engine.
0 like 0 dislike
by (13.6k points)
HI there

Next step is to check the fuel pressure and check for vacuum leaks on the intake manifold. If nothing is found to be wrong, do a compression test on the engine.

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