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My wife's 1994 Jeep Grand Cherokee did the same thing a few years ago. Long story short, it was the camshaft position sensor. On the 6 cylinder engine, it is located on the driver's side of the back of the engine where the transmission bell housing bolts to the engine block. Hope this helps.

Answer I drive an 89 Jeep grand Wagoneer with the 360 motor. I was having the same problem with mine and I was so frustrated I was ready to scrape the jeep. I found a mechanic that told me to change the ECM module. It is a 4"square silver box on the drivers fender. Since I change that my jeep has never stalled due to the heat. I hope this fixes the problem. If it does not you will need to repair or replace the distributer The ECM module operates the distributer.

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Q: Why does a 1987 Jeep Wagoneer suddenly stall in hot weather or when warmed up?
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