I don't think pcv is the problem. O2 is definitely a problem...I can't remember if bank 1 is post cat or not. You could be getting a misfire from a bad plugs, wires, or a pack (multiple misfire because pack is not giving juice to the wires). Or it could be misfire from inappropriate fuel-air mixture due to bum O2 sensor (insufficent activity/slow response). The too rich is prolly from the misfire.
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