I have a MERCURY classic 50. It was running like brand new. I was going 20mph. I hit a stump. It stuttered and slowed down to 7 mph. One time it caught up and started running like new again. So I shut it off. When I started it up again it cranked and idled like new. When I open it up. It surges for a second but will only go 7mph. Sure hope you guys have an idea of what might be wrong. Can't afford to take it to the boat doctor right now.
Thanks

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