need help CEL for 1998 4 codes

A

antennaejim

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Light just came on the other day. I have the following codes all at once. P0136, P0139, P0303, P0304. What would cause these all at once? It says misfire in cylinder 3 & 4. As well as O2 sensor circuit malfunction and slow response on bank 1 sensor 2. Any ideas?
 

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