This Fuel injected Duece suddenly started loading up and stalling at idle,speedometer quit working at the same time, I checked for intake leak with carb cleaner, plugs were very black so I replaced them. I suspect something is making this thing run rich but I do not know test procedures, I have Harley Soft tail repair Manual but it doesnt give diagnostic procedures.Any Help would be appreciated. Bike has 39,000 miles, new cams and chain tensioner 500 miles ago. Thank You