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p0305 code cylinder #5 misfire on 2002 Mazda MPV

2002 mazda mpv 3.0 i have a p0305 code i interchanged the coil and still got the code. but what i noticed i disconected each coil one at a time at idle rpm (700) and every time i disconected one the engine would shake exccept when i got to # 5 nothing would happen when i incremented idle speed i disconnected 5 again then i noticed change in engine. I think its a clogged injector please advise.

Asked by for the 2002 Mazda MPV
It could be the plug or injector. You should check to make the head is not cracked. (common problem and with this cylinder) Do a pressure test on the cooling system and a block test to make sure it's not a cracked head before spending any more money.