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This seems to have helped so far... I accidentally tried to start the car with the electrical connector on the IAC disconnected, and the car wouldn't run, so that means the unit is still working. I plugged it back in and the car started right up and idled fine. After a while, the idle dropped...

I have a 1991 4 cylinder EFI Mustang. When I first start it up, it idles rough, and if you don't hit the gas a little, it will almost stall out, or sometimes it will stall out. (This car is not currently on the road, so I haven't been able to drive it and see how it reacts; however, when it was...