i had a failing iacv. cleaning the screen didn't help at all, and after a week more the thing completely failed. 200 bucks later I toss a brand new iacv on there, and all idling problems solved. cleaned the fitv, too, and no I have no more warmup idle problems.
Odd thing was, I could drive mostly okay with the iacv wiring disconnected. I did notice it acted different when I let off the throttle, but it wasn't horrible. Still, it was a pain to even start the car without it.
IACVs are funny things.
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