Question about 2001 Pontiac Grand Prix

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2001 Grand Prix GT 3800 series engine

I have a 2001 gp gt and after I put a new battery in it the car runs at a low very erratic idle speed used to run about 1000rpm now wavers between 7 and 800. When I come to a stop it idles so low that the engine just shuts down and other times going down the highway it will stop accelerating and slow down then with my foot still on the gas it will catch and speed back up again or just shut down. Any input would be greatly appreciated

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  • j_nelson84 Jan 18, 2009

    I put fuel injector cleaner through it. Plugs, wires, fuel filter, air filter, and oil has all been replaced and changed before I left for college this past fall. These problems just came up when I put a new battery in a couple weeks ago. Others have told me it could be a throttle position sensor? The check engine light is also on.

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The best solution is to do a complete tune up with new spark plugs, wires, fuel filter, air filter, pcv valve and oil change.. If this still happen I would get some fuel injector cleaner, or use marvel mystery oil in both your oil(crankcase) and gas tank. You can get mystery oil at walmart..its in a red bottle with black label.

Posted on Jan 18, 2009

  • Shane Fowler
    Shane Fowler Jan 19, 2009

    go to autozone and put it on the computer for free..it could be a bad o2 sensor also...

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