sporttruck88 Posted January 1, 2019 Posted January 1, 2019 I have an '88 MJ with a '90 4.0; when I start it up it idles fine but after I've driven it a while, the idle gets as high as 1600 rpm. If I shut it off and and restart it the idle goes back to normal but goes back up again after driving. Any thoughts?
cruiser54 Posted January 1, 2019 Posted January 1, 2019 Have you ever visited my website? I would suggest completing Tips 1 through 5 before doing anything else.
RangerDB Posted March 5, 2019 Posted March 5, 2019 And if 1 to 5 don't work, I'd try #11, it cured my idle problem.
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