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Q:

After about 15 miles I get intermittent miss and it will die when coasting. on 1993 Jeep Grand Cherokee

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It fires right back up after it dies but the intermittent miss is still there until it has sat for a couple hours then it will run fine for about 15 miles. It has new tune up plugs wires cap & rotor. new fuel filter and fuel pressure regulator. no check engine lights.
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I have seem many Jeep crank sensors fail. Usually when they get hot. I would have a professional check it to be sure.