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I've noticed that sometimes when I hit a hard bump my transmission will slip out of gear for a brief moment. Kinda like throwing it in neutral and back in drive. The rpm's will rev up until re-engaged. I have an 88 XJ 4.0 with auto. No tranny modifications. I'm curious about what is causing...
Does anyone think the EGR valve might be the cause of the intermittant high idle? Do they wear out, stick, carbon build up causing a vacuum leak? PS. I don't know anything about the EGR system but I've checked everything else and I'm running out of ideas.
I've had the same problem for a couple of years on my '88. I've noticed that if I shut it down (usually at a red light) and cycle the ignition 4 times w/o starting; the idle will return to normal after a brief run up. I know for sure it's not a vacuum leak or any of the other usual stuff.... I...