2001 mercury efi 150 with throttle body

by Larry
(Roanoke, Virginia )

2001 mercury throttle body

My boat starts engages in gear and when I throw the throttle forward to plane it bogs down instead of accelerating. I have changed the water separator and spark plugs. Also I have checked the ignition coils and moved them to working cylinders. I seem to have 3 which do not make a difference when I pull the coil wires. I am going to use a spark check tool this evening. I have also seen to check the high pressure fuel pump. I am unsure to do this as to how many replacement gaskets etc I may need..