I really don't no what cause the dead stick,My engine is the Toc 53,it has been a dream,only my second dead stick and the first one was on the first flight about a year ago.I don't no if it could be bad gas,i forgot to remove the fuel the week before,and i just added new fuel to what in the tank already on sunday.What do you guys think,would fuel in a tank with the vent open spoil in 7days????