Mine does that too. I'm wondering if theses symptoms are the cause of the IAC.
1. Start Up - Car Idle's at a high rpm 1500.
2. A Brief Moment after Start Up - rpms drop down to almost = dead.
3. Put Car into reverse - rpms drop and then goes up really high
4. same thing for putting the car into drive.
Just yesterday, I came to an almost complete stop and the car apparently lost power. It seems sometimes my powersteering does not work either.