at the risk of threadjumping I am in the middle of a no-start situation and was reading through this thread. I bought a Duralast ign module from Autozone earlier today because I already had a good extra coil pack...
Here is my question, my car started losing throttle response, was idling rough, and then died while idling and would not restart. When I got it home and started checking it out I found the coilpack looked liked it had melted down (pic should be attached) It was supposed to be a new GM unit (bought from board member) that had been running fine for a few weeks.
I also found a firewall ground that was not completely tight so I fixed that and installed my known good coil. I still have no spark so I am wondering if the module is bad after all. Is there a way to check my module that is on the car to confirm it is bad?