Okay. Let me start off by saying that if you told me my muffler bearings were out, I would tell you to put in some new ones. That about sums up my mechanical ability. Now on to the problem. I have a 15 foot aluminum boat with a 9.9 Johnson outboard, electric start, early 1990s vintage I believe. I have owned it for about 7 years. I fish local lakes around Mansfield, and the motor probably logs less than 30 or 40 hours a year. It has been virtually trouble free, except that it never would run at idle speed. Not a problem for me because I use a trolling motor. Okay, so I go to the lake sunday morning, can't get much going, and notice a couple of boats trolling for Hybrids (I assume). I rig up, put the throttle at idle speed and it purrs like a kitten. I nice surpise. After about 30 or 40 minutes of trolling, the engine just quits. Didn't sputter, or bog down, just quit instantaneously, and would not restart. Engine cranks, but won't even think about firing? No noises or odors. Any ideas where I might start to look for the problem would be much appreciated.