I never did figure out the problem. I had a lot of work done on the wiring harness, and I replaced relays and sensors on a couple of occasions. The thing had a mind of its own. It worked when it wanted to, and not when it didn't want to. About the only thing I didn't replace was the computer. I finally just gave up on trying to get it fixed, and wired around all of the controls.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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