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  1. Johnson 90hp 2 stroke, model year 1997 if I remember correctly....a few weeks ago I would intermittently lose power, rpms would drop and boat would lurch forward, just for a second and then back to normal...would happen 3-4 times in a day....since I owned the boat I had always used ethanol free, but due to change of ownership at local gas station and living remotely, I had to use E-gas for about 4-5 tanks early this year...initially figuring a fuel issue, or something clogged, I drained the gas and filled with shell 91...and I regularly use seafoam with each fill up...I think I remember the owners manual saying E gas was ok to use though?? same conditions continued for 2 weeks, starts up fine, runs fine and then randomly RPM's drop 400-1000 and feels like the o/b is stuttering for a few seconds and then back to normal....if I backed off the throttle that didn't really help anything...so whenever it acted up, I'd come to a stop, and rev it up with the high idle button pushed in...figuring maybe that would clear something out...it would resume back to normal operation the issue got really bad after 3 hours of boating last weekend, complete loss of power, feels like the engine is stuttering/slipping, throttle at wot and barely any power...I stopped using it immediately and finished the day with my kicker towed to the nearest shop and after a week they can't figure anything out, they've just told me everything is OK, they cannot produce my symptoms and they aren't able to test under load in their shop apparently and nearest lake is 1.5 hrs one way....said their techs will spend a bit more time on it this morning but basically they didn't find anything wrong any ideas on this? anybody had similar issues? or anything to bring up with their techs? if it's not a fuel issue, maybe electrical? which I know nothing about compression tested and ok, spark plugs ok, hub is ok (I think rpms should spike with a spun hub, not drop), fuel filter replaced....if they didn't find anything, not optimistic about my next day on the water...thanks for any feedback
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