No.1 cyl. missing (bad) when I pulled the plug it was wet, just the one...

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When I bought the car it had a miss, after replacing plugs wires cap and button. After 50-75 miles it starts missing again so from left to right I pulled the plug wires and the 4th didn't seem to make much difference, so I pulled the plug and it was very wet. now after replacing the plug and pouring 5-6 ounces of marvel mystery oil through the vacuum line the miss is not nearly as bad j