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this may be the crank sensor,,,these will do this when they start going bad...the parts store can give you a printout of its exact location
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Crankshaft Position Sensor Operation:
A magnetic or hall effect sensor that provides the computer with the engine speed and crankshaft position so proper injector sequence and ignition spark can be determined. It allows the ECC (engine control computer) to change injector openings as the engine RPM changes. It also signals the coil packs to fire the spark plugs.
To remove the sensor:
If the crankshaft timing sensor or the camshaft reference sensor is removed, follow this procedure when the sensor is replaced:
Spacer on crankshaft timing sensor and camshaft position sensor.