I have a 2015 Yamaha Viking. We recently had a flood and I had to take it through high water. After the flood it started to get harder and harder to start. Eventually it will start after 4 or 5 try's but even when it is running it still is hesitating trying to bog down. I have to constantly stay on the gas. I have changed the oil, air filter and spark plugs and it still acts the same! Any ideas?