This Chevy truck is suffering from multiple issues, the main one being stalling at idle and then intermittently not starting.
In Part 1 we go through a complete diagnosis of the crankshaft position (CKP) sensor circuit and show how to 100% determine wiring integrity and if the sensor is indeed faulty.
Part 2 will include "after repair" waveforms, how to perform a "CKP Variation Relearn" procedure on a GM truck, and an explanation of the snag that threw me off in Part 1.
Enjoy!