Place chuck roast in crock pot. Combine remaining ingredients in mixing bowl. Pour barbecue sauce mixture over chuck roast. Cover and cook on low 8 to 10 hours or 4 to 5 hours on high. Remove chuck roast from crock pot; shred meat with fork. Place shredded meat back in crock pot. Stir meat to evenly coat with sauce. Spoon meat onto sandwich buns and top with additional barbecue sauce if desired.
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