Here we go another idle problem. I have a b16a with stock IM and TB. I tried searching but cant find to much on my situation. When the car is cold the idle sits at like 2500 and when i first start the car it will rev like 3 or 4 times. After the motor warms up the idle drops to about 1500 and that is as far down as it goes most of the time. Only sometimes after driving for awhile the idle will drop to 800/900. What is most likely the problem and how should I go about fixing it.

 

Wait till I get back there and then I'll fix it for ya! J/K
Check for any vacuum leaks
Just for the hell of it, clean out your IACV

 

i would go with the IACV.

 

I would start by checking for vacuum leaks.

Then I would take the FITV off from under the throttle body and take the end of it off and make sure the big white plastic screw is all the way in.