P0304 means that cylinder 4 has a misfire and P0305 is a cylinder 5 misfire. What this means is you may have bad spark plugs, or bad plug wires, or you may need to replace your distributor cap and rotor. I would start with plugs and wires.
P0305 is cylinder no. 5 misfire detected P0304 is cylinder no. 6 misfire detected
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