Q: truck will start and run for 20-30 seconds and then dies

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Trucj just died one night going home. It will start and run for 20-30 seconds and then dies. Ive replaced the fuel pump relay, fuel filter, fuel pump, fuel pressure regulator, distributor ( complete ), ignition coil. The truck will run on propane.

My car has 265000 miles.
My car has an automatic transmission.

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