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6.2 MPI BR3 320hp merCruiser

My mercruiser engine (2002 220 SeaRay Sundeck) has developed a rough idle but at higher RPM seems to run smoothly. This problem is followed by two consecutive beeps on the Audio Warning System and repeats every minute. This system tells me somethings wrong but the dealer does not know what the signal means. Anyone have a suggestion?
 
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