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MY Buick HAD A SIMILAR PROBLEM. IT CAN BE CAUSED BY EITHER THE CRANK OR CAM SENSOR. BOTH SIGNALS ARE NECESSARY TO FIRE AT THE CORRECT TIME. THE ERROR CODE SHOULD TELL IF THAT IS THE PROBLEM.

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Q: Your 91 buick regal runs for about 15 to 20 minutes then shuts off and wont start and has no spark let it sit 4 an hr or so and it fires right back up?
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