Has anyone ever experienced this?

I have had my boat for just under two years now. It is an 04 Centurion Elite V. I know some will say well thats your problem. Well here it is. I have not had a problem with the boat at all. Backed it down the ramp and went to fire it up and it back fired. Turned it over again and fired right up. Problem is now I have a loud sucking sound through the throttle body. Also took it out for a spin and the throttle stuck. I got the throttle linkage squared away, but why the sucking sound. Everything appears fine. Boat runs great?????? Just has that noise.