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If #4 is wet, check spark on that plug before replacing anything. Even then could be a plug, wire, cap, or other things like the closest to the vacuum line for the fuel pressure regulator. Could be a fried injector. Replace parts AFTER you have done the proper diagnostics or you could be throwing money away. Poor injector connection could be the problem but it does not sould like that.
They key to proper repair procedure is to identify the sympton, then the cause of that symptom before replacing parts.
The symptoms you have described would not lead me to conclude that a distributor is necessary and the cat issue would possibly be resolved by elimination of the fouled plug.
regards
Mech
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