92 cutlass supreme ignition problems

i have been trying to figure out whats wrong on my brothers car, it was cutting out when driving it and from my past expieriance its an ignition module, got a used coil pack from a salvage yard, it wouldn't even start with that one, just backfire like the plug wires were crossed, i double checked the plug wires and they were right. put the old coil pack on and it did the same thing, the night before it would start and run. got another coil pack from the salvage yard and now the car don't even fire, no spark at all on any of the coil packs, i can't believe all three are bad, i'm gonna find somebody in town that has an ignition module tester and have them tested to make sure they are good. any other ideas or suggestions on what to check is greatly appreciated, oh, and its a 3.1 motor on a 92 cutlass supreme. thank you very much.

chopperguy