why missing

So I was out yesterday and I hit another boat wake pretty hard the motor then kinda missed for a second I figured since it is a carburated engine that it was not that big of deal but for the next 20 min. or so is was acting a little funny almost missing like. Then it just kinda went back to normal and ran fine for the rest of the day. This is the 2nd time this has happened this year. The motor is a PCM 5.8 351.I replaced the spark plugs this year so it's not them. Any ideas on what it may be?