Yamaha 200 2 stroke, won't stay running and won't get up to speed

Hey y'all, first time posting here. Im having some problems with getting my boat up to speed. I have a Yamaha 200 outboard v6 2 stroke, on a 20' Boston whaler. I do all the necessary startup procedures and she starts up most of the time, sometimes it shuts off almost instantly. When it gets started and finally stays running, and you try to speed up, after a little while she suddenly drops to idle and then will cut out. It's sounds like it's wanting to speed up but it's really sluggish. The boat has sat for some time so maybe just a tune up is needed but I'm not sure. Any help would be appreciated

Pull the carbs clean them thoroughly. Blow air through all the passages. Also use carb cleaner or soak them. Iv done it more times than I can count and iv learned one thing above all others, if you think you've cleaned it enough clean it again. A single spec of dirt can wreak havoc. Do that and get back with us. Good luck.