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Before I replaced anything I would get all the wiring connections straightened out. That could be causing all your problems and you could be chasing nothing. Not saying that there isn't a problem but I would rule out other things first.


Yeah, this is the first step.
Second step would be to get a wiring diagram and make sure everything else is hooked up correctly. If they did the ECM piggyback that way, who knows what else could be mickey moused....

I don't think this would be your problem as the idle speed is controlled by the ECM, but a lot of times when a blown motor is rev'ing up and down at idle, it's simply the idle speed is to slow. Idling it up a little generally helps.

1995 Trooper LS auto 3.2 DOHC /w SOHC intake
1989 Trooper 2.6 auto
1989 I-Mark RS DOHC 1.6
1991 Stylus XS DOHC 1.8