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Thanks for your advice. I replaced all 4 plugs and the one coil to the misfiring cylinder (the store only had 1 in stock) and the wires. This fixed everything except the o2 sensor so replaced that. Mechanic friend checked with his computer, everything is passing, no check engine light, just need...

My 03 Mazda Protege5 has 4 codes coming up. I'm wondering if they are all related or separate issues. The biggest is P0303 cylinder 3 misfire. Pulled the plug and it looked burnt around the bottom as well as a little charred above the nut. Replaced it but it still feels rough on 10 mile test...