Bucking, misfiring and cutting out

Update on the Buick century. The customer said cost was no option. We replaced the crankshaft position sensor, with again no fix. Pulled that off and put it back together. Next was the ignition control module. Finally we had some improvement. But now we had a constant misfire under load. We were getting a low number of misfires on number 4 monitor, around 6 to 14 per cycle. The wires were just replaced a few months ago and they looked great, so we then went with the number 4 1 coil. This is what the problem was from the beginning. We figure the coil was shorted out to the control module, as the 4/1 coil sits above the electronic part of the ignition module. We will not be forgetting about this one for a while. Thanks for letting me share, GH