I have a Yamaha 2018 20 hp outboard. It was not running, but I had a guy come over and halfway fix it. It starts and runs at low RPM When you try to kick it up past five or 7 miles an hour, it dies. My neighbor said it might be a vacuum hose. I don't know I can post a video if you want to see what happens. What I think is a fair deal is you tell me your experience and come on over. It's in the water. I'll hand you 40 bucks just for coming down and another $110 if you get it running full speed. If you think you need any materials, I can run for them while you're here as long as they're available at AutoZone. Maybe you have run into this problem before and it's an easy fix and maybe an easy 150 bones :)! Give me some brief experience and your phone number. Let's get it going