3.0 90 lebaron I noticed my idle is low when the ac is on. The car does not stall but the voltage drops below 12v since the idle is low. As soon as you move its back to 14.4 v. When the car is at idle i can unplug the IAC motor and nothing happens . I bought a new motor and the plunger thing was not extended all the way and the car rev at 4grand. I took the new one out and put the old one back in that seems to be fully extended. I unplugged the old one and let the new one hang from the wire. It never moved. I am just glad my old one is stuck closed or my car would be at full idle. What makes the motor move and what needs to be replaced. Sadly i dont have a TPS spare since 1990 was a one year only tps. I think the reason my car even idles is i turned that do not turn screw a long time ago.