I have a 2006 Yamaha 225HPDI engine on my boat. Here is the problem that I am experiencing. We took the boat out to the lake and you throttle it down it goes good then loses power then it gains power then it loses power over and over again. I can go back and squeeze the primer bulb in the boat will run good. I replaced The paper filter in the separator also the metal filter on top of the electric fuel pump. Also I replaced all six spark plugs. It continued to do the same thing after that. Has anyone experienced this problem and if so what could it be. I just ordered two low pressure fuel pumps that should be in any day and the little strainer filter that is inside where the electric fuel pump is. Please help me and let me know what I can do.I also ordered a new primer bulb because someone told me that the primer bulb could simply just be bad.