So i took my boat to the lake last week is 1995 90 hp force motor, i couldn't get it to plane the rpms were les than 2500 at wot so i went back home i clean the carburators, replaced the fuel linea and a new filter and i check my spark plugs with my multimeter for continuity form one end of the spark plug to the other end and i dnt have continuity i checked other spark plug from my mercury and i have continuity is that normal for my spark plugs on my froce no continuity?