Noticed reduced power from the outboard its a v6 so i put new plugs in and ran all day it pulled the plugs and i see a yellow white sludge on the number six plug not a lot but around the cavity in the plug. I still think there is no fire on the cylinder i am assuming that water has made its way into the cylinder some how. or maybe fuel in the line i did change the water seperator can any one please help. All the other plugs look great.