I've got the same problem and I think it's got something to do with the crank position sensor being fouled...
the steering wheel..
Its going bad.
A whistling noise indicates a vacuum leak.
play in the drive train
Would this cause the car not to start If the EGR VALVE is bad
you might wanna chage the plugs and wires. what other symptoms does the car have. i am having the same problem in my 2003 pontiac grand prix gt
water temp sensor wire grounding out could cause this problem.
blown head gasket
Typically, a bad or "going bad" alternator.
There are a few reasons that would cause your 2002 Pontiac back speakers to only work sometimes. The most common cause is a loose or corroded ground wire.
bad eletrical system ground wire some where!
Idle speed too high.