Spray inside of a large crock pot with cooking spray. Place pork roast inside. Pour 8 ounces of Coca-Cola ( I used a measuring cup) and water around pork. (It does not need to cover roast) Sprinkle evenly with garlic salt, salt and pepper. Cover with lid and cook on High heat for 6 hours, or on Low heat 8 - 9 hours.
Remove pork from crock pot and transfer to cutting board. Discard liquid from crock pot. Shred pork with two forks, and remove any fat.
In a blender or food processor, blend the remaining 8 ounces Coca-Cola, diced green chilies, enchilada sauce and brown sugar. Blend until smooth.
Place shredded pork back in crock pot. Pour enchilada sauce mixture over the shredded pork. Cover crock pot with lid and cook 2 hours on Low heat.
Serve pork in burritos, salads and tacos!