I think I may have a similar problem. after the car is warm it does not want to idle properly and will almost stall sometimes, and if I rev it up, it takes along time for it to come back down. I took off the idle air control valve and its clean. I put ohm tester on it and it was continuous. I put it back on and started the engine without plugging in the iac and it would not even stay started. It seems to be good. But I don't know, maybe it could be going bad? or does it sound like i have a different problem. The car is stock except for k&n intake and hpipe exhaust. I am having some issue with the 02 sensors, I dont know if the problem is related or not.