Your hotfoot is not properly returning the engine's throttle linkage FIRMLY against the idle stop.
This needs to be addressed ASAP to prevent gearcase damage and/or PCM faults.
Could be a simple adjustment, cable in a bind, or loose return spring on the hotfoot.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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