Took out my new to me boat for the first time today. Taking off it would lift the bow no problem but as soon as I broke over to get on plane the motor would bog down then rev up and build speed and repeat. It felt like I was accelerating ina stick shift car. The boat was just about on dead E when I got it and I added 12 gallons of fresh gas to the tank. Any ideas on what I should do or where to start.