pringlechip88 Posted February 14, 2008 Share Posted February 14, 2008 Hi i have an 88 Comanche that i just finished installing a 96 cherokee engine. when i start it up it revs up really high and does not idle back down. i was wondering what is causing it. i think it is an oxygen sensor but i really don't know. any help is greatly appreciated. thanks in advance Link to comment Share on other sites More sharing options...
TNT Posted February 14, 2008 Share Posted February 14, 2008 Give us some details. Which harness are you using? And what throttle body did you use? It hard to say. Did you swap all the sensors or what did you do? Link to comment Share on other sites More sharing options...
pringlechip88 Posted February 14, 2008 Author Share Posted February 14, 2008 the harness came off of my 88. the sensors came off my 88 engine. the throttle body,lifters,intake,exhaust came of the 96 engine. thats about all i really can say i guess. sorry for not having all the info :oops: Link to comment Share on other sites More sharing options...
bhorocks Posted February 14, 2008 Share Posted February 14, 2008 check you vacuum lines... Link to comment Share on other sites More sharing options...
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