so i have a 1990 cherokee with a manual trans. and it was idleing really bad and i have already checked if the iac was dirty and it wasnt so the next thing that came to mind was the tps was not set correctly. so i borrowed a meter and tested it, sure enough it was way off! i went online and got instructions just to be sure i was doing it right. the instructions said that the reading (after calculation) should be between .825 and .835, .830 being perfect. mine was around .330 so i was shure it was off! i thought that all it needed was a little adjustment but here is where i ran into a problem! When i was all the way to the brink and it would not move any further i was still only coming up with about .435 and i could not do any more to change it! if i went the other direction it went down back to even lower numbers so WHAT DO I DO?????

 

Replace it.