No Spark out of the Coil?

This is a repost. I am working on a GMC Jimmy w/ a 4.3 L engine. I had no spark to the plugs so I chased it back to what I thought was a bad Lead wire from the coil to the distributor cap. I did a complete tune up with wires, plugs, rotor, cap, and a new distributor (with the new cam sensor) I tested the coil to the primary and secondary resistance and it test ok, but for the $20, I replaced that as well. Still no joy. I replace the ignition module on the back of the coil. No Joy. I am getting 12 VDC out of the coil, my primary and secondary resistance check out, but I still have no spark from my coil, I have a scan tool for the OBD II, but I have no codes to reference from the car, it sat with a dead battery for a few months and nothing was stored. After my last post a few thought my Crank sensor so I replaced it and checked to see 8 vDC into it with a good ground, so where can my problem lie? Any help and specific help would be greatly appreciated.