Twin 2004 225 ev DI's. 138 hrs. Ran great at end of season (Dec). Gave it to the dealer to winterize and store with about 30-40 gallons left (20 in each tank, Tanks hold 129 each. Computer readout at end of season says no problems with engines. Compression checks all good, no water, etc. Added 200 gallons of fresh fuel just before launching in early April. Boat runs like crap. Both engines run rough and sometimes stall when giving gas and also when returning to idle. Dealer checked everything and says "Bad Gas". No water in either of the 2 fuel/watar seperators for each engine. Dealer says he conditioned the fuel that was left when storing. Anyone else have this problem??? What in the gas would cause this???