was out today and brought the boat up to 20 knots no issues no worries, slowed to troll for the day and on the way back in was back up to 21 knots, but all of the sudden lost all kinds of power couldnt get it above 12 knots, no matter how much throttle. after about 20 mins. it felt like it "grabbed a gear finally" and started to speed up. this only lasted a couple seconds then it dropped back down to 12 knots. engine sounds and behaved perfect. could this be an out drive issue. i just repowered with a new engine...could the outdrive not be liking its new friend? been out for the last serval weeks with great performance..felt the power thing just a bit when i came into the harbor last week but thought it was an anomally. well i guess not... can anyone help me here?