Why is my Grand Prix not accelerating when I press the gas?

Asked by papapedro890 Nov 23, 2020 at 05:05 AM about the 2008 Pontiac Grand Prix Base

Question type: Maintenance & Repair

So I'm driving probably 55-60 and the rpms dropped suddenly and that's when this started happening. The engine would rev to 3000 rpms but wouldn't go any faster than 50mph. If I shift to neutral it revs to 4500ish and if I press the brake it stops revving. In park it idles fine. In drive at a stop sign it acts like the alternator is bad with the lights dimming but the thing is only a couple months old. Turn off the car and start it back up and everything goes back to way it should be. Anyone have any ideas here?

1 Answer
18,645

munron answered 3 years ago

Make sure all electrical connections are clean and tight. Inspect the grounds. Have you scanned it for trouble codes? That would be your next step.

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