I have a stock Black Max 225 o/b. When I bring it down to an idle the engine tends to load up after a minute or so. When I open it up it runs sluggish for about 2-3 seconds before rpms start to rise. The plugs look great and I am running QuickSilver oil. Since this enigine is EFI, Is there some way to adjust fuel flow, etc to prevent the engine from loading up during idle. The engine runs strong at WOT. Any thoughts or suggestions would be great.