2005 Mercury Optimax 150, have twins starboard side issue

by Timo
(Oak Island N.C.)

Starboard side engine idles rougher than the port side motor, and when I've run it for an hour it will die at idle. Starts right up and will run as long as I give it gas, but when I bring it back to idle will shut off. Also this starboard engine alarm will ring if I go over 4000RPMs bring it down a little and alarm goes away. Does this same thing every time I go out.

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