My '93 GT (AT, 157k miles) is idling low (a steady 500 rpm) in gear at stop lights etc. Out of gear, it is dead-on around 750 where it should be. Previously I had to replace the solenoid valve that opens up when you turn on the AC-- this one appears to still be working because when you first turn on the AC, there is a little blip in the rpm's and it levels back off nicely at 750. However, I think I have figured out that this is not the IACV proper, which appears to be located on the bottom of the intake manifold. Do you think I have the symptoms of IACV failure? If so, do you think it can be cleaned, what exactly do I need to do and use, and can anyone give me an approximate resistance I should find across the coil (assuming it is a solenoid)? Just need a little more info before I go tearing stuff off my motor. Thanks!