need help with my 89 cutlass calais 2.5

About a week ago my calais quit while driving down the highway. I found that it wasnt getting any fire to the plugs. Since then i have checked the wires, changed out the coil packs, the crank sensor, and the ignition module. No luck. I checked the wiring to the ignition mod, no shorts to ground, no opens. The 12V reads fine with the key turned on. All the fuses are good. When i plug in the code reader i get a constant code 12(no faults found). Yet i still get no spark from the coils. Anyone have any insight that might help me?