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Irregular idle '89 Pioneer

I have an '89 4.0 Cherokee Pioneer. I have been having an idle problem for some time. Sometimes, first thing in the morning, or after work on my way home, when I start it, it will idle way up at 2500 rpm for a while until I shut it down and try again. Sometimes (usually in the summer) parked in the hot sun but a cold engine, it will start fine, but when I go the idle will be so low it will stall, this is very annoying, it will be stalling one minute and the next minute it I am idling about 1800 rpm, coming to a stop sign I have to really press hard on the brake (or throw it in neutral) and sit there like a moron with my engine revved up.

I have taken it twice to my works mechanics (commercial) over the past years and they did something to it that worked fine for a year then the problem came back. I have a new vacuum hose harness. (but some hoses are old)

Richard

Reply to
Richard
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Our 88 does that every couple years and every couple years I open the electrical plug on the TPS (throttle position sensor) on the throttle body and clean the contacts inside. That does the trick for us. I use a real spray contact cleaner usually, but WD40 will do in a pinch.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Richard wrote:

Reply to
Mike Romain

That must have been it because I merely unclipped it and blew off some dust and it runs like a champ! I bought some cleaner, I will do it right tomorrow. Thanks!

Reply to
Richard

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