okay i have a 96 xj 4.0 just did head gasket and now it idles at like 2300 dont know y and it jumps up if its in neutearl ????????????????????????

 

I would start by rechecking all my vac lines, sounds like a leak. besides that you could check the idle speed motor see if it has just stuck, or need cleaned etc.

 

yeah all my lines look good and r on but idle speed motor ???? where is that ?

 

Look at your motor standing at the front bumper. Your idle speed motor is under the air boot twards the front . It has two bolts that hold it on to the throttle body and a three wire clip going into it.Its round and silver.

 

You could also go to TeamCherokee.com type in the search window Idle control motor that will show you a picture of what it looks like.