That was a good call, FORD302GUY
! I would have suspected the ECT first, but you were right!
If it runs better disconnected, then it was obviously generating a false signal. As suggested, they have a tendancy to become extremely fouled, and when that happens, it takes them longer to aknowledge the actual temp of the air it's supposed to be measuring. For that reason, cleaning them will sometimes work, but usually not for very long. If it were me, or one of my customers, I would definately replace it with a new one. Ask for an IAT
(Intake Air Temperature) sensor if they don't understand ACT
(Air Charge Temperature) sensor. The terminology changed in 1993, so it's a crap-shoot as to what they may call it. Up until 1992, it was called an ACT sensor, but since 1993, it's been called an IAT sensor.