If its not nessasarily the IAC motor that is causing the problem with the idle, then what is it? I had the multimeter on the sensor wires and it would spike every once in a while from 0 to 12v maybe that is what causes the hesitation... and as far as the motor itself, It moved, but not correctly. I turned my motor on and it came out but when i shut it off a little later(the air was geting through the iac hole and causing high revs) the probe didn't go back in very far at all. like a 1/8th inch. i also had cel 14 one time. hasn't came back...i have 12,15,25,14,25. thats the most cels i've ever gotten. 12 is battery, 15 is speed sensor(my speedo don't work) and both the iac problems and the map cel which is no longer there after clearing the codes.