Everyone,
It certainly appears that my ignitnion control module (ICM) didn't have a good ground. I tried measuring it from the heat sink on the top of the case to ground and there was no continuity, but I didn't know if the top connected to the base.
The base is painted on both sides, so the side touching the firewall was painted and the firewall itself is painted so one would expect that there was no good (or probably no) ground.
I tested the mounting bolt head to ground which was good, due to the rust around the mounting bolt hole in the ICM, I don't think that was a good ground either.
There are some star(ish) washers on the mounting bolts so I suppose those were supposed to create the ground. I should have sanded a bare spot on the ICM housing to test the continuity before I removed it. So all I know now is that there probably wasn't a good ground.
