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Address the O2 sensor codes. They point to a bad #1 sensor and a bad #2 sensor (#1 before the converter, #2 after the converter).
Handle the new sensors with extreme care. Do not use anti-seize. This can foul the sensor tips. (When my cars (Porsche cars) needed new O2 sensors I used factory sensors. They came with a light application of some clear grease on the threads.)
With the error codes gone then see if misfires are still present.
With exhaust system work an exhaust leak is always a real possibility which could account for the misfires.
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