Question about 2004 Jeep Grand Cherokee

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For some time the rpms will jump about 200 rpm while I'm driving at highway speed. It doesn't feel like the trans is slipping but the revs constantly jump even with cruise control on. My mechanic couldn't find anything wrong with it. Now the check engine light is on and it's shifting erratically.

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Had the same problem. In my case, the wiring harness was scraping against the vibrating motor and wore through the insulation. This caused the computer to think the throttle position sensor was bad and the RPMs were erratic. The engine light came on and indicated TPS. A short time later, more of the wires became damaged and the engine started missing cylinders. My problem was at the top rear of the engine where the harness runs over a metal stud (right behind the valve cover). Check your wiring harness. Not an easy find until you actually look for it specifically.

Posted on Nov 08, 2010

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