Creedence

Alright this is the problem:

Car started and idled weird, barely caught for awhile. The main problem was that the RPMs would drop low when coming to a stop in drive and then bounce high, basically making my car do a launch when i came to stoplights whether I wanted to or not. The other problem was that when I took the car out of drive and put it in park or neutral, the RPMs would drop low, and then either catch, but most likely the car would just stall out. Oh and this didn't really do it so much when cold, just when hot.

So I went and replaced the IAC valve, the car ran beautifully, no issues with this stuff, now the part where when I take it out of drive it stalls is back with a vengeance. I cleaned the mass air sensor, no dice. I have heard vacuum leak from some people and EGR from some but I really don't know where to start with this, so like the thread says, anyone who wants to give some input on this is welcome.

red2k1gt

Have you played with the TPS at all (throttle positioning sensor)?

Creedence

Negative...wouldn't that cause issues while in drive too though?