5.7 omc will not start. When I turn it over, it revs up for about 3-4 seconds and dies. I have checked timing alinement, checked fuel pump, replaced distribitor, changed spark plugs disconnected the shift interupter and nothing seems to work. Also someone said to disconnect the tack, did it and still nothing.We checked the spark on each plug while turnning it over and it seems to missfire on very second plug. That is why I disconnected the three
plugs to the interrupter. And you know the rest it will not start. I am running out of patience and summer.