No Spark!!

Hey everbody, i have an 86 deville, i love it. the other day i started it up and let it idle for about 5 minutes to let it warm up and it started fine and seemed to run good, but when i got back outside it wasn't running, it turns over fine, is getting fuel, but not firing. i found later that there is no spark. i replaced the dist cap, rotor, and coil but still nothing. has anybody had this problem or know of any other thing it could be? could this be a possible BCM, ECM, or ignition mod problem?

Verify that all the electrical connections to the ditributor are good. If you don't find anything, you might want to pull the ignition module and have it tested. When they fail it is often in this mode, good one minute and dead the next.

yea.. after replacing the coil and dist cap I replaced the ignition module and started on the first turn!
thanks very much for your help. Merry Christmas!