my number 4 cylinder keeps missfireing can you help me on 2001 Mazda Tribute

i have a v6 24 valve i replaced the spark plug and plug in module the gap on the spark plug is currect i heard that its a common problem with this engine because of moisture is this true how can i corrected

Asked by for the 2001 Mazda Tribute
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do you have any eng codes? if so post so we can adv
code says no 4 cylinder miss firing only code on my code reader i have a top brand code reader