Hi guy's i had my chris craft out the other day and my starboard 454 350 started running rough and droping rpm's and then just quit.......I changed all fuel filters and that did nothing it tries to start but just will not stay running. When i checked the sediment filter after it was almost empty? I checked the anti syphon valve and it seems to be working, i tried to run it from the sediment filter from a fresh gas can still no help? I then checked spark and it seems weak not sure fuel or fire or both ran great before this??????? I AM LOST!!!!!!!Please help you guys are the best THANKS.