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Answerchange your key switch.

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I had the same problem on my 1990 Jeep Comanche 4L & just got it out of the shop a couple weeks ago. It was a fuel pump relay on the passengers side under the hood. Look for a row of black block shaped four-pronged fuse

Had same problem tried a lot of things..had mechanic stumped as well.. So we decided to change the distributer to a HEI unit...cleared up the problem and has worked great since.

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Q: Your 1989 Jeep Comanche turns over but dies automatically after you let go of the ignition how can you get it running again?
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