Working on a 2007 Lucerne that is showing misfires on the 3/6 cylinder with my AutoXray..... I changed the coil pack for the 3/6 cylinder and still had the problem...we did all the plugs and wires and still have the problemb showing misfires on the 3/6....what now?

There are still a few auto parts stores such as some Advance Auto stores that can test your ICM at no charge. The ignition control module will have to be removed and taken to the store for the test. I would call around first to see if the store has the proper equipment. Years ago many auto stores had this capability but hard to find this service today. The BWD company manufacturers the ICM testers that I am familiar with. There may be other good testers as well.

The Advance a mile from my home has one....I'm headed up there this afternoon.

Great news! Please let us know the outcome of the test.

Most likely it'* the ICM.

Are you actually clearing the faults after each repair is made?

What ^^^^ said. I think you have to clear it or it'll still ignore the 3/6.