This engine has not been started in over a year. Today I turned it on and it turned over like a champ so we put it in the water. At low speeds it does really good but if you try to advance the throttle it revs up a little bit and then starts to bog down and dies. When I start it back up it turns right over but does the same thing when I try to go faster. We opened her up and the carbs are sweaky clean. Anyone have any ideas on what's wrong or where I should start? Any help would be much appreciate. Thanks!