2002 200L carb Mercury ! serial OT513797 on a 2002 896 Nitro Boat with a 24 Tempest Plus prop . Motor bogs down if I idle at 6 mph for more than a few min . Also on take off will bog down but if I throw into reverse and get rpm's to 3000 and then go into full throttle forward will run fine ? I have changed plugs in last 20 hours of use and regularly use sea foam at every fill up ! Have had the idle issue for awhile but take off problem is new ! Has anyone had this problem and what do I need to check ?