May be the Crank Position Sensor is not working well. It sends out the RPM signal to the PCM. If it is bad, there is no RPM signal, and the PCM will not command the injectors to fire and/or the ignition coils to spark. Easiest way to see if it works is to hook up a scantool and crank the engine. Monitor the datastream for RPM. If you see RPM then the sensor is working, if it reads zero RPM, then there is a problem with the Crank Position Sensor circuit.
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