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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.
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by (13.5k 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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