Have a 1989 175 Yamaha on 20' Mako CC. <br /><br />SYMPTOMS:<br />Earier in the season, while running at 4000 RPM's and above the engine would jump up a 100-200 RPM's every few seconds. Below 4000 RPM's it would run fine. 2 Weeks ago I brought the throttle up to 3k RPM's and the engine would...
