I've read all these threads but none I can find seem to describe my issue. It seems similar to some.. Here goes.   I ran my 230 yesterday without any issue, trailered it and went home. Put it back in today and almost couldn't crank it. Volts were 100% and it just whirled away. It usually cranks within a second or two, this time it just cranked and popped a little. I raised hatch and saw what looked like fuel smoke coming from exhaust up around the platform. It smelled very rich. I went back and tried again with no luck so I have it throttle while cranking and it finally cranked. It ran rough for 10-15 seconds and all seems fine now. This is the only time it's ever done it.   Fuel filters both have only 85 hours on them. Distributor cap and rotor are new also. Plugs are good. The boat runs great all but this one issue.   Did any of you guys with IAC/IAC muffler issues experience this?