Q: The 3rd and 4th cylinder are fouling the spark plugs. What could be the problem?

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I believe my truck is misfiring in the 3rd and 4th cylinders. I bought new spark plugs it helped for a while then it stared putting and bogging after about a week or two. I think it might be the distributor but i dont know. What do you think is the problem?
My car has a manual transmission.

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