mitsubishi galant es 4cyl

My 02 galant has been having problems It starts fine idols fine and as it warms up it starts missing at idol and upon acceleration also if I put it in gear after just starting it misses under load I've checked plugs wires compression (was getting a cylinder 2 misfire) all of those checked out good I also checked my egr valve and vacuum control valve to see if they are holding a vacuum and they are. Don't know what to try next is it a vacuum leak or something else.
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