Re: 115hp evinrude outboard
All engines will run fine on the hose. It's when they are level in the water that the problems show up. Check the spark to each of the cylinders. Put an inductive timing light on each plug wire and see if you get strong, constant flashes from the gun. See if all the plugs look the same. Check to see if any plugs are wet, indicating they are getting fuel, but not firing. While you are checking it out, a compression check is always the best place to start, as it creates a baseline of general engine health before you get into specifics.