hi. I recently bought a boat with a 1987 85 hp motor. It had run fine until recently. I keep it at a slip at a marina and we had a few rainy days, and I hadn't gotten there to bilge it out. When I finally did there was about a foot of water in the boat. I pumped it out and when I started the motor, it started fine but when I hit the throttle it died. Over and over again. It sounds like its gonna go, it;ll lunge a few feet, then die. I thought maybe some water had gotten into my gas( it has a built in gas tank and the cover is on top in the back of the boat) so I added 5 gallons of new gas with a can of seafoam to see if that was it but it does the same thing. sure sounds like it wants to go, but just won't. I'm a novice to boat repair, but it seems like a simple thing. Any ideas?