Combine brown sugar, paprika, salt, and garlic powder in a small bowl.  Rub mixture into ribs, and refrigerate for 30 minutes.  

Meanwhile, combine ketchup, cherry preserves, and Worcestershire sauce in a small saucepan over medium heat.  Bring to a gentle boil, reduce heat, and simmer for 5 minutes.  Remove from heat and set aside. 

Preheat the grill to 300 degrees.  Place ribs bone side down on the grill and cook for 30 minutes. 

Remove the ribs and wrap in foil, adding 1/2 cup apple juice or water to the foil packet, then return to the grill and increase temp to 375.  Cook an additional 30 minutes. 

Remove ribs and discard foil.  Baste the ribs in the cherry bbq sauce, reduce grill back to 300 degrees, and cook 15 minutes, then remove from heat.