One last possibility
One thing I forgot to mention... Someone had tried to cut my cats out last fall, but I guess someone spooked them and they left the job unfinished (half-asses). I crap-welded it back together in a hurry, but they had cut before the 2nd O2 sensor, and it leaked a little. Now I've put in a new cat and exhaust, but is it possible the computer calculated for the leak and never reverted to what it should be? It's a long shot but I wanted to make sure I mentioned that.
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