P0303 code (#3 cyl missfire)

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Hello to anyone... I have a 96 civic ex with this annoying check engine light that i cant seem to go away. The code is P0303 #3 engine missfire. I have changed the spark plugs, wires, distributor cap and rotor, distributor, and recently replaced the head and re did the timing and now i am kind of confused as to what i can be next. if someone could lead me in the right direction it would be greatly appreciated. Thanks, Andrew