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60hp Mercury 4stroke stalling when accelerating and surging at idle

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I don't have a meter to check, I had a mechanic try to isolate, but he was not able to. I can ease the throttle after it is warm and get to full throttle and seems to do ok but sitting still at idle when cold I have to let it idle a while. If I raise the idle to 2500 rpm it will stay there for a minute and then stall out.
 
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