First time one this. Need Immediate assistance from anyone who knows best.
Vehicle: 98 Acura Integra GSR 100k miles(STOCK motor, NO Mods)
Problem: Scan Tool reads error code P0304 = cylinder No. 4 misfire
Symptoms: vibrations, lack of power (as if only running on 2-3 cylinders)
Done so far: Replaced spark plugs and wires; checked coil for cracks as well as inspection of complete distributer's internals. (code reset 2x = engine light repeats and code P0304 still exist). I also noticed that upon removing sparkplugs, 2 plugs are foiled in oil. (ALSO prior to ever receiving check engine light in the first place, there has been a slight piston slap for the past couple months).

So, with the piston slap situation put aside for now, i am trying to determine what is the cause of the No.4 misfire. possible bent/burned valve, OR injector? i am damn near to a point to just replace the whole motor. If anyone out there can maybe steer me to the right direction, Or any possible way to correct this problem, your info would be greatly appreciated thanks!