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Hi, welcome to Just Answer. My name is***** problem is most likely caused by a bad crankshaft position sensor. If the car will not start you should test for spark to the spark plugs and test the fuel pressure. If you have no spark to the plugs I would replace the crankshaft position sensor. If you have no fuel pressure when cranking the motor I would suspect a bad fuel pump. The more common problem is a bad crankshaft position sensor, especially if the car would usually start after waiting an hour. The sensor is located at the back of the motor directly behind the left cylinder head.
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