1988 Caprice Won't start

I need some help with a problem. My car has 37,000 original miles on it. Recent tune-up to include plugs, wires, cap&rotor. The Distributor has also been replaced. Carb has been rebuilt and set. Car runs great. But recently it quit on my wife and she couldn't get it started. I have no spark at the coil. Power is to the coil. The snapon scanner shows no codes. TCC command is on w/KOEO and 4th gear is P1. I replaced the Ignition module and the computer w/no change. Please any advice would be appreciated.

Hvae you checked the coil itself? Sounds like you've found the problem already to me....