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Saint Simons Island Mercury Salt Water Series 150 HP Dies when Idling

Has anyone had this problem? Motor runs well until upon idling for 5 to 10 minutes it drops rpm to 500 or so any then dies. It will start back up fine and then die again quickly. Any suggestions to solution? I just replaced the Idle Control Module with no improvement. What to do next??? This is a 2 stroke 1999 engine.
 
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