Serial Number 1B519074
I have a 2007 mercury pro xs 225 has roughly 400 hrs on it been having issues for about the last 4 months. When running boat wants to start surging at high rpms like its starving for fuel. We have changed new fuel lines primer bulb from tank to the motor. Pulled vst cleaned and checked pumps are good. Have 100lbs of fuel pressure at fuel rail and 90lbs of air pressure. We have put it on computer everything electrical is working fine. Had injectors cleaned checked all the diaphragms everything is working order. Stumped on where to go next other than tieing a rope to it and using it as a boat anchor. Please any help would be greatly appreciated. Thanks