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Emissions problems. Check to see if the EGR valve is working correctly, the IAC valve, coolant temp sensor (the one beside the thermostat), and the MAP sensor. These sensors are used by the PCM to run your engine. Fuel overload has been a prob with mine...time to check the PCM next.

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Q: 1991 Chevy G20 conversion Van engine starts then shuts down after about five seconds after about ten tries it finially starts?
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