Bayliner 175 Rough Idle

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Bayliner 175 Rough Idle. I own a 2005 Bayliner 175 with a 30 Mercruiser motor. It has a SAE J1223 carb.

Sold Bayliner 175 Br Boat In Bethel Island Ca 137475
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I have a 2004 Bayliner 175 Capri Runabout with the 30 liter Mercruiser engine. When I removed the spark plugs last fall they were black indicating the mixture is too rich. New gas new filter still will not idle under 2K rmps.

As far as the starter goes and considering the boat has sat for awhile you probably have a sticking starter slave solenoid.

Even now with about 35 hours on it it often cranks for 5-10 seconds to start. And when it does that the engine like shakes. Mercruiser 30 Idle adjustment. Fouled or improperly gapped Spark Plugs.