...Sounds like the 'Ignition Switch'!(Or the wires From the switch to the Coil). You get Spark while cranking, But No Spark when the Key is released back into the 'Run' Position. So the car starts and then dies as the Key is released from cranking. For this to occur, There would have to be 'The' Bypass wire from the Starter Solinoid to the Coil + side, it Bypasses the Ballast Resistor and supplies the full 12 Volts to the Coil, ONLY During Cranking!!...
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