The two previous posts sound like the are from more mechanically skilled users than me, so take this for what it is worth.
Water in my gas(90 HP outboard) caused same issues last year. Had to get some gas out, place in a coffee cup for several hours. Water will settle on bottom. Had to then check filter and clean carbs and then replace gas.

Happened again a month later. Found main fuel line hose from side of console to top of the tank had dry rotted and was allowing condensation to get in.