Hey guys, bought a new to me boat with a 1999 Evenrude 150 V6 spitfire. The boat ran great on the lake with no issues until the third time tonight. At 3/4 throttle the boat would make an extremely hard jerk every 3 seconds or so in forward. Doesn’t seem to do it in reverse. The boat will run like a top until 3/4 throttle. I’ve read elsewhere it could be a bad clutchdog. Anyone have any insight? And if it is that is it a hard fix at home or better left to the professionals? Thanks in advance.