It was a real heavy rain storm and started to flash flood. Put a bottle of Isoheet in the gas tank last week when it happened.
Bought an offset screwdriver kit today and the map sensor came right off. It was cracked by the screw holes and the top started to separate from the bottom. Replaced it with the map sensor from my v6, threw in a new spark plug to replace the broken one in cyl 3 and she fired right up first try.
No misfire symptoms or CEL whatsoever it idled and drove at any speed any rpm like it did before this incident, if not better.
Scangauge showed a new p0131 code for the upstream o2 sensor though, probably from leftover moisture passing through the system. As well as a p0500 for the vss which I knew was bad but never showed a code.