Ok so my dad has a 93 16.5' crestliner fish & ski with a 75hp mercury outboard on it. The boat hasn't been in the water in probably 3 yrs but started maybe twice a yr. He wants to get it back out on the water but here's the problem.....Its fires up but runs really rough and dies if you don't rev it, he took all the old gas out and replaced a few hoses that were disintegrated basically and just wondering where to look next to save some time. Fuel filter and plugs are the next step and any advice would be appreciated. Thanks