HEY for all you boaters, i got a 99 baja w/ a 502 merc.mpi. Last year it was bogging down but cleared up the more i used it while changing the water separator. This year it started out fine and then all of a sudden it bogged down and now i have four dead cylinders.I have spark but no fuel going to those cylinders. My options are the injectors or a pump. But what are the odds of four dead injectors. ANY ADVICE?: