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i have a 92 model 40 hp yamaha jet prop motor i bought a couple of years ago. did run good unfortunately i let it set too long. i got the carbs rebuilt ran good after that but later in the year started messing up by running good 30 seconds then bog down. i thought is was sucking air through the fuel line. i got all leaks stopped. now will fire up and then die after it dies it will not start again. it seems to be firing ok I've got new fuel. carbs have fuel in them. it will start all over again next day is it possible I'm flooding or maybe plugs thanks for any help