Hello Captains.
I have a 1998 Mercury 250HP EFI (2-stroke) that boggs at mid throttle. It starts and idles well. Once I throttle it up at about 5-10 knots it begins to bogg. If I keep the throttle at 1/2 to full throttle it boggs for a very long time (5 mins or more) chugging along, and then...