1993 9.9 Merc motor ran great(at lake), brought boat back home. Decided to change plugs. At next outing, it started hard and ran bad (hardly moved boat). Checked plugs, top one looks like a normal firing plug, bottom plug looked clean(like just out of the box).<br /><br />1. Screwdriver in plug wire test good spark.<br />2. Top plug color "good"<br />3. Bottom plug "clean, just like new"<br />4. Rotated coils, No fix<br />5. Changed plugs, No fix<br /><br />Not sure what to check next?
