ANSWERS: 2
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Have the fuel pressure tested after it is warm. Sounds like the fuel pump is failing after running for awhile.
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This is just a guess, but it sounds like maybe your engine is flooding. It could be that a failed temperature sensor is causing the computer to adjust the mixture to be too rich. I would check the coolant temperature sensor and any other sensors that are sensitive to temperature. Also, the Oxygen sensor is involved in adjusting the fuel mixture and a failed one often leads to a richer mixture.
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