Did some searching but couldnt come up with a definitive answer. I have a 90 model 88hp evinrude, model number E88MSLES. Took it out for the third time this past weekend and when riding at 3/4 to full throttle, sometimes it will jerk the boat and it sounds and feels like one of the gears might be missing a tooth or something along those lines but it only does it every once in a while but seems to be getting worse. It only does it for a split second and then keeps on pulling just as good as it ever has. I am not going to run the boat again until I figure it out. Could it be as easy as changing the gear oil or could there be more damage? I am going to change the oil one day this week to check for metal and water.