my cherokee will not run...well it starts up but doesnt idle right, it just lopes at a very low rpm. i have replaced the tps sensor, checked for vacuum leaks(found none), and made sure that all of the head bolts were tightened correctly but it has done nothing to help. what should i do next, is it the MAP?

 

have you checked for vacum leaks?

 

yes i did

 

Sounds like what mine was doing. It was my Idle air valve.

 

Does it have any trouble codes?