Emission Systems For Cars And Trucks Cheapest Parts On the Web

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 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 not spark from my coil, so where can my problem lie? Any help and specific help would be greatly appreciated. Oh and it is OBD II and I have no codes to reference from the car, it sat with a dead battery for a few months and nothing was stored, or can I have a bad computer or would the crank sensor, if bad, not allow high voltage to pass the coil? Any help would be appreciated