99 Cav 2.4 Coil or Coil Housing Problem 3x in a row

[pappyl]

1999 Cavalier w/2.4
- Got a random misfire code, kind of figured problem with a coil, rubbers, or plastic housing. I have 2 other complete assemblies I knew worked fine, so I swapped 2nd unit in, and I was up and running just fine, until about a week later....
- SAME damn thing.
- This time I figured I had a bad plug and it was somehow burning out a coil, so I put in new plugs and swapped in my last complete assembly. Up and running just fine, until about a week later...
- and again it did it.
- Parked it and have not looked at it yet. 3 problems in a row? Something is causing this - beyond coincidence.
I plan to connect the unit up with ignition wires and use my timing gun to verify the problem... but I suspect the problem is either the coil or coil housing,,,, but 3 in a row seems just a little too strange.
Anyone have any ideas?