i'm new to this forum but hopefully someone can help me with my problem. i have a 2005 20'6" sea pro with a yamaha 150 4 stroke. it has been sitting with a full tank of gas since august and i took it out for the first time yesterday. it started off slow and would only get up to about 3500 rpms and 20 mph, then after about 20 minutes of running it wouldnt get above 3000 rpms and 10 mph and refused to plane out. i was told to try emptying out the fuel filter and the fuel/water seperator because water would mix in the the fuel from sitting so long, and that didnt seem to help after doing so 3 times. my offshore season is right around the corner and i need to get this problem fixed so any help would be greatly appreciated!!!