Question about Pontiac Grand Am

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I have a 2000 Gran Am with a 2.2liter, auto. I have been having a drivablity problem. At first, when parking on an incline, it would idle rough while in gear like it had a bad miss. For the last few weeks without a sign, it started getting worse. When you start it after sitting overnight or when leaving work , it will idle like it is running on 3 cylinders and will surge badly. Will want to die when coming to a stop, but when driving at freeway speeds, runs fine. You have to feather the gas or put it in netrual to keep it running at a stop..the weird part is that after driving on the freeway for about 10 miles, it will be fine, just hard starting, but doesn't run like it is on 3 cylinders....check engine lite is off and on with only a code p0300 for a misfire.

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  • dalesulli Oct 15, 2010

    I know that the CPS has allot to do with engine performance. But why would it start to drive better after warming up? It is now starting to act like it wants to cut out and surges all the time when it comes to a stop and is constantly hesitating....I will replace the CPS, but could there be another problem????

  • dalesulli Oct 15, 2010

    I will see what happens

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Hi! Please have the CPS (crank position sensor) be checked, this has big contribution on engine performance. If the cps is faulty you'll surely have misfires. Hope this shed some light and have a good one!

Posted on Oct 11, 2010

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