I have a 2000 model 90hp Yamaha outboard. I just had the carbs rebuilt, new fuel filter installed, new fuel lines and new spark plugs. The problem I have (and have had since I bought it) is that I can crank it and it will run good for a minute and then just goes dead. If I idle it up it will run but as soon as I idle down it goes dead. Now once it finally warms up after many attempts of cranking/idling up for a few minutes it will run and the rest of the day I can cut it off and it will crank back and run with no problem. I do not believe it is "just cold natured". What am I missing?