[Northporter]

My 2001 Coronet 2900 is equipped with small block mercruiser V8's.  Apparently they are equipped with something called an air idle controller that kicks the throttle up when first starting.  As the engine warms up the idle settles down to about 700 RPM's from about 1200 RPM's.  My question is are their others who experience issues with the air idle controller?  My engines invariably stall unless I modulate the idle as it's settling down.  Plus I would like the engines to idle closer to 800 RPM's to eliminate spark plug knock but I'm told the idle is not adjustable?