93 Schematic in shop manual shows "G100" as PCM chassis ground source.
The ICM is grounded through the mounting plate.
The reason I offered that as a check is that it is also on the list of causes for a lean O2 error... guessing an intermittent loss as opposed to a constant loss. Anyway.. I will double check it in a min.
Here we go. I had to reinstall my scanner
Hard to see the "G100" in the seam of the book... sort of dark and blurry.
1993 Red SSE - Bone-Stock except for High Perf. Power Antenna-Original Owner. Less than 130K - Love of my Wife
'05 Magnum R/T Hemi - Bunches of classic VW Beetles... and one "not quite stock."