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Hi, I am Mike, welcome. I'm reviewing your question. Can you tell me the year, make, model, engine.
Did you check the gap on the spark plugs before installing them? If so, did you by any chance get 2 spark plug wires put back on, on the wrong cylinders/crossed?
This diagram may help to determine which spark plug wire goes where by looking at the color wires on each coil on plug.
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