Re: 225 Pro XS missing (Lpolk)
You should change the filter and it is probably time for plugs if you have never done so. Mine was doing the same thing and a new set of plugs and a new fuel filter fixed me right up. No more miss. I keep my fuel treated all year long with marine stabil and quickcleen. I also switched to 89 Octane.
The miss I had was a slow speed miss. Boat ran fine other than that.
Re: 225 Pro XS missing (Lpolk)
As long as you're USING the boat regularly, and topping off the fuel each trip (with appropriate fuel stabilizer and quickleen added).... you SHOULD be fine. Mid-grade (89) octane fuel MAY have some benefits in your case (especially in the idle/off idle performance area).
DEFINITELY WAY overdue for a fuel filter. Here's a link to the recommended ANNUAL (once per year minimum) maintenance items for your engine:
http://www.bbcboards.net/zerot...gines