Engine will only start when I put my foot on the gas pedal?
This would lead me to believe that you have a vacuum leak. This may be an external leak or internal. The most common would be a cracked PCV valve hose or a sticking IAC Valve. The Idle Air Control Valve is what controls the vehicles Idle so that it maintains a nice and smooth 800 rpm(in neutral). Replace the IAC if you suspect it is the root of the problem.
IAC Valve 2002 Pontiac Grand Prix
I went ahead and looked up the IAC Valve that will fit your 3.1 liter engine in the Grand Prix. Not too expensive and only requires the removal of two screws and one electrical plug connector.
IAC Location
Thanks for your answer as it was spot on. After I replaced the spark plugs It started right up without using the gas pedal but it would die when I came to a stop. I unplugged the IAC Valve and went for a ride and it never staled at all. So you are spot on with your answer. Thanks for your time
Update- I’ve tried two different enexpensive IAC Valves $15.00-$20.00 and can’t get it to idle right after putting 30 miles on it. I then tried a Forty dollar Delphi brand with the same results. I am waiting on a $70.00 AC Delco brand that should be here tomorrow and if that fails to give me the correct results I guess I will then look at it’s circuit and other factors.
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