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dmrose,

I had a similiar problem with my 1986 3cyl Yamaha 40. Essentially, I took the three carbs off and removed the bowls from each of the three carbs. Then I used some carb cleaner and sprayed the jets with it. After I did that, I thoroughly cleaned the rest of the carbs with the cleaner. After I reassembled the carbs, I started the engine and slightly adjusted the idle so it would idle at just a little higher RPM than it did before. Solved my stalling problem and that was 1 1/2 months ago. You may have something clogging your carbs. It doesn't take much to clog up one of your jets.