My 1967 40HP Selectric Shift Evinrude will shudder, shake, or vibrate when I'm trolling. It shakes enough to feel it and see it in the steering wheel. When I leave my seat to adjust a rod or downrigger, I will start to turn. I troll between 1.5 - 2.0 mph. I'm usually on the lake every Sunday for four hours or so trolling. After trolling I run it WOT to clean it out. It won't shudder in neutral or WOT. <br /><br />I changed my black oil covered Champion spark plugs with Champion spark plugs and it still shuddered. This has just started in the past few Sundays.<br /><br />Any suggestions?<br /><br />I thought I found the answer to my problem on this forum last week but I can't seem to find the posts I searched for.
