I have two 98 XJ's. I have been working on one that had very high idle issues. I replaced IAC, TPS and also tried 2 different MAPs twice. still same problems. couldn't locate leak anywhere, so I decided to take the throttle body, complete with sensors from my "good xj, and put it on the other and damn if that didn't solve the problems. so, I now I've narrowed it down to the throttle body or sensors. I have cleaned the throttle body again.still no longer luck. Any ideas? Thanks in advance.