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I have a 2000 Grand Prix, 3.8. When I turn the car off and try and restart it 10-15 minutes later, it runs extremely rough until I can get it into gear and step on the gas to clear it out. I have a noticeable reduction in MPG since having this problem.


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Sounds like you have a leaking fuel pressure regulator. See this link for more info..
http://www.greatautohelp.com/inspection ... ator1.html


   
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Replaced regulator and hasn't corrected problem. Ran ok for a couple of weeks, though no noticeable increase in MPG and still some rough idle on a hot restart. Now its abandoned me beside the road with it's rough idle, won't clear out.


   
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is the check engine light on? If it is on, did you check to see what your codes are?

you may need a scanner to look deeper into your problem. Look for the misfire counter and see how the engine is doing. Is there one or more cylinders that the computer is seeing as misfires? Then you can narrow down on what to look for, spark, fuel injector, fuel pressure, compression...


   
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