2000 GMC Sierra Engine will not start

Electrical problem
2000 GMC Sierra 6 cyl Two Wheel Drive Automatic

Performed major tune-up(cap, rotor, plugs, wires, air filter and fuel filter). Got a crank sensor intermittent code, which prompt me to check the integrity of CS, ignition module and the coil. All these components checked out OK, so I decided to replace the VCM. I purchased a reman VCM, did the relearn procedure, but truck still has the same problem. I suspect the reman might be defective. Note! I also checked voltages and ground to VCM and they are all good. I also tried a junk yard VCM, which starts the car, but dies instantly.