i have b16a2 engine , when i start the engine at morning the idle flactuating between 2000 to 3000 rpm, after warming it will become between 1000 to 2000 rpm, is the problem is IAC ? nothing appear or ecm light, i have to replace it or i can clean it?

 

i would try and clean it first, gunk from unclean coolant will build up in it. i had the same problem. i just ended up replacing it. they are rather pricy. around 125 or so.

 

i got the problem, i have an air leak between the intake manifold and the throttle body, i got anew gaskate and install it, its now perfect.