I have a 40hp, 4cyl, 2 stroke 1992 Merc. It ran great all last year. I started it last wknd, it ran about 5 seconds and then died. I tried to start it and it would'nt go. I have spark in all 4 cylinders (put new plugs in anyways), gas is getting to the carbs (I even put a drop of mixed fuel/oil...