Ok so I got my boat back from the mechanic a couple weeks back (older boat..nothing special). He fixes my navigation lights and said he had to replace a fuel nipple Bc it was leaking fuel. So first couple trips boat runs fine.. And then one day it just goes bad! The motor sounds like it struggling to get gas... Hard to explain but it's like lunging ad won't get up and go.. Thought it might be bad gas? Change the gas today and it runs better.. Sweet!!! But it's still doing the same thing but not even close to as bad. Itll let me get on plain but when it's wide open it' starts that lunging again and have to slow down. Any suggestions to what's the problem?

Sounds like fuel restriction motor information will get you better advice

I would try a new set of plugs. Maybe they got fouled out. That's how mine was running and put in new plugs and that was the problem. Just my 2cents.