Question about 1999 Pontiac Grand Prix

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My grand prix, shifting problem.

When going up a hill at speed the RPM's will surge from 1800 to 2200 and the car starts to buck, but when you step on the gas the car will finally down shift. If you don't push down the gas the trans, won't downshift. the problem only happens when driving at low RPM's 1500.

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  • Anonymous Feb 14, 2009

    my car shows code p0742 it says theres a electronic circuit stuck what can do to fix this without changing my trans

  • dukman851 Mar 17, 2009

    I have a 2001 grand prix gtp that surges as you described under light load (with or without the cruise control) and I have to either let up on the throttle or gun it to force it to downshift to stop the surging. i did the complete tune of plugs, wires and coils (130k on the clock) and it still does it.

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I had the sam problem it was because my upper ignition coil was corroded. i replaced my coils and spark plugs and wires all at once and problem solved. if you don't have the cash for that you can try cleaning the connections but that's only a temp fix it will be doing the same thing agan within abot 2 months.

Posted on Mar 05, 2009

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Other possible problem is that in your transmission has an electronic solinoid mated with your transmission valve body ... When this is starting to go , you can have shifting problems, engine missfires ( IE: Bucking , Sluggish , Poor acceleration ) . Proper way to diagnose would be with an auto diag. scan of your computer ...

Posted on Feb 13, 2009

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I need your help i cant get my car to go in gear i have a pontiac grand prix se edition its in park but wont go in any other gear but it does turn over.

Posted on Jan 28, 2009

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Sounds like you need to check your throtle position sensor first. that will cause this problem.you can go to autozone they cancheck it with a scanner. hope this helps you out . Phil

Posted on Jan 17, 2009

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