So i recently upgraded to some neeon injectors. The Jeep runs really good but everyonce and awhile, the tach will start to work then stop and ill get any idel of 1500 and it will stay there. I bored my own throtle body, below the butterfly and theres a new IAC in it.
I thought about installing a stock throtle body.

Any ideas?

 

4.0L I'm assuming, but what year?

 

Ya i guess that would help

1990 Cherokee with 94H.O and a 99 intake manifold.

 

Any other mods?

Sorry, I don't really know how to troubleshoot this one, just trying to get more info for the Renix guru's once they get here.

I've heard that the Renix jeeps act real funny some times, I wouldn't know though...

 

take some brake cleaner spray near injectors, if you have an oring leaking it can cause high idle, spray some throttle body cleaner near each injector if one (or more) is leaking itll kinda of stutter. advance sells the orings if you need them. You can try to make sure they are pushed all the way in if you have a leak, or try removing and coating orings with oil, or vaseline.