Idle problem, 310HP Carb, Sometimes

[CWS_Kahuna]

Sometimes my 2001 Mobius 310HP Carb motor idles real bad then stalls. Other times the boat runs perfect all day. What could cause such varied performance like this. I run 91 Octane gas only. I am 99% of the time always at the same lake. Could I be getting water in the gas? I just had my boat serviced and have been out 4 times since. 2 times the boat ran perfect. 1 time I had real bad problems with it stalling while trying to pickup a fallen rider at idle or no wake speed. The other time It just had a little harder time starting, I had to feed fuel everytime to start when normally I don't have too. Any ideas?
Thanks

[Darrell Land]

I have had the same problem. I adjusted the idle up a little and it seems to have worked. I have a 2000 Kanga and the same Indmar 310 engine