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2006 merc 4 stroke 9.9 Idle now surges.

fphowell

New member
This engine used to idle right but now surges. changes rpm and can't set idle to 960. If I do set to 960 it doesn't stay there long and surges to 2600 or more.
The nut holding linkage just above set screw for throttle link rod fell off as I watched it. At least I found it and re-applied. Is there any adjustments to this or just tighten?
Any suggestions appreciated.
 
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