I have sort of an odd problem on my used 15HP (J15RCIS) Johnson outboard for my boat and wondering if anyone else has run into this. Most of the time the motor runs beautifully and starts and runs very well. Twice this year though when I've been out on the lake it runs fine most of the day but then you'll start it, head off get the boat onto plane and the motor will just dies like it's not getting gas. At that point I can pull start it and it's won't catch unless I choke the motor and even then it won't stay running. Both times it's happened when I took the cover off the top of the motor it's finally started and run okay even when I put the cover back on. The plugs look good and are a light tan and were just replaced (It's done the same thing on two different sets of plugs). I'm leaning towards either something in the carb bowl or a float sticking closed, or some type of electrical issue, possibly a bad powerpack. Anyone familiar with this series of motor have any ideas? I might just bite the bullet and do a carb rebuild and go from there.