1996 Pontiac Grand Am won't idle in park when warm?

[alex.]

When I first start my car up, it will idle just fine when it's cold. But once it warms up, the idle will go up for a second then drops to 0 and the car dies. But only if it is in Park. If it is in gear and I have it idling it idles just fine.
Any ideas?

 

[Andrew]

your computer and sensors, try that...take it to a garge and have them hook it up, they'll run a whole analysis test on it. Plus its cheap, and if your lucky, free...