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    Mercruiser runs great for 20 min, then loses power, any ideas?

    I changed the water separating filter, plugs, distributer cap before the boat went in the water two weeks ago. The two times I have run the boat, after about twenty minutes the port engine will loose power, but not stall out. If I back off the throttle, it can get the RPMs back up to 1000, but...
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