While you're in there spray some contact cleaner in the sliding potentiometer and move it up and down a couple times and spray it again. Repeat two or three times, just to get all the crap out of there. That's what helped mine out. Chances are your old one was in perfect condition and you could put either in after cleaning and resoldering them. Or clean and repair one, swap it in, clean and repair the other, and then resell it. Profit!!
1996 Jeep Grand Cherokee Limited Edition 4.0L
3.55 axles, stock pretty much everything, except for a PSC steering gear and fuel injectors