Trim pork roast. Add grill mates seasoning and place in slow cooker. Cook on low for 8 hours or high for 4 hours. Take out of cooker and use 2 forks and shred pork. Put shredded pork back in slow cooker. Mix ketchup, vinegar, brown sugar, worchestershire sauce, and ground mustard together. Pour over shredded pork and heat until heated through. Mabe another 1 hour.
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