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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Clogged cat will give really funny readings on the map sensor. Gut your cat, get the engine running good, and see if the code comes back. If it does, take it from there.
I'm shickled titless to know that you found it, doubly so knowing that it was through a logical, methodical troubleshooting sequence rather than by shotgunning parts.