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I have a 2012 40hp murcery with power tilt. When I'm at idle or trolling at idle speed the boat shudders pretty bad. If I tilt the motor down all the way against the boat it gets better but it's still shudders pretty bad. It will do this even when I'm in neutral. I bought this boat used. The boat and motor looks brand new. I changed oil. Gear oil. Fuel filter. And spark plugs. I think the motor is a 4 cylinder. But I only found 3 spark plugs.if anyone has any advice please chime in. Thank you
Model# 1a40413kz
serial# 1c166443
Model# 1a40413kz
serial# 1c166443