Car used to idle at 1500 or so when cold, and drop down to 1100 when warm. I took off my IAC and cleaned it, put it back on and now the car is idling at 500 hot and cold. Car revs smoothly, but once i let off it drops to around 200 for a second and almost stalls. Any help is appreciated!

EDIT: I unplugged the IAC, started it up, turned it off plugged it back in, and now it’s idling perfectly. I’m guessing the ECU just didn’t like it.

 

Pull your FITV (fast idle thermo valve), its right next to the IACV. Take the cover off the side, and make sure the big plastic screw is screwed in properly. Make sure you dont have any vacuum leaks on it, i use a little ultra grey if i dont have new gaskets for it.

Edit: Huh. Ok well glad it’s fixed.