Yamaha 15 hp 4 stroke not idling

[etheridget]

My motor has recently begun to run very rough at idle (if at all) and it will not continue to run as I shift into forward. I have purchased a new fuel filter and plugs for it (not installed yet) and plan to discard the current tank of gas that it is running on and replace it with fresh gas. It will sometimes run in fast idle if I can coax it to speed up before it stalls out.

Is there anything else I should consider before taking it to a mechanic ($$$)?

Thanks!

[boats.net]

The next step would be to remove and clean carb after replacing plugs and filters.