Question about 1999 Jeep Grand Cherokee

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1999 Jeep Grand Cherokee / Approx. 133,000 miles - Owned since new and very well kept. Only at idle, engine stops working but would start again after 20 min wait, would work fine for a few days and do it again. Brought to shop, all tests run, computer has no engine problem history. After a couple of weeks of that, the problem became so bad that had to leave it at the shop and leave it there. Took them 1.5 days of idling to finally do it in front of them. Showing both spark and fuel pressure. Changed the computer and the car ran great for one week and did it again while idiling. Changed Computer again and Crank Case Sensor and car ran great for month and a half. Just did it again but this time while on the highway. After a 2+ hour wait, car started again (while taking it off of Flatbed) like nothing happened! What's is going on? Country: United States Make: Jeep Model: Grand Cherokee 4x4 Year: 1999 Engine: 8 clyinder

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I would try your pickup coil in your distributor. I would also be checking the o2 sensors. both of these things can cause problems like this and would not set off the check engine light.

Posted on Nov 21, 2010

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