What else can you tell us about other problems you are experiencing?Car runs fine, would not believe that it needed anything

You didn't mention air filter. Has that been changed?It was checked when I had the car inspected 1 month ago

Do you have a lockable gas cap?no

Tell us more.
This is a 2001 grand prix with a 3.8 engine. Best gas mileage ever gotten was about 18, in winter getting 10
Spoke with (emailed) danthurs said have the PCM checked. Mechanic checked this and said it was ok.
Then I called a Pontiac dealership and ask him if he would check the PCM.
He told me that if it wasn't working that a light would show up on the dashboard.
According to dan, he could have run a computer check up on this and maybe adjust, but the dealership said no

Someone at your place told me to check the PCV valve but I believe that the mechanic would have checked this upon inspection

Perhaps if you gave me your phone number I could call you and eliminate all these emails??

***I merged your multiple threads so we've got everyones information right here***

so what do you think??

can the pcm be checked or is it simply ok and does not need to be readjusted??

Check for any fuel leaks around the filter, fuel line, injectors, etc.

there are no leaks I would have noticed them in the drive way. What about the PCM

can the pcm be checked or is it simply ok and does not need to be readjusted??

moved to it'* proper Mechanical Section. General Chat is for items that affect all platforms and "General Chat". It really helps the GearHeads, others with ownership of same/similar Models, the Forum regarding search bots, and our own internal search engine when we keep things in order. Thanx.