So took boat back out, installed new fuel pump, filter, and tried different hardware to push propeller out because it looked like it was rubbing. And nothing changed, so I retarded timeing and seemed like it helped alot. Then when I would trim all the way down it seemed non existent. And I could rev t out fine. But if I trim up some it would do it. So we cruised t a while with trim down messing with it and playing with timeing. I didn't do timeing because t didnt have a diming degree marker on it. Just the one to set motor at tdc. But after cruising for a little bit we stopped to fish and eat. And then after we went to take off again and it would feel like it pops out of gear or slip at around 2500 rpms until I throttle down and it would kick back in or or grab again and no matter what I do it would do it...also I lost the zinc anode. Would that cause it to slip?