Tangy Barbecue Sandwiches

In a 5-qt. slow cooker, combine the first 12 ingredients. Add roast. Cover and cook on high for 1 hour. Reduce heat to low and cook 6-8 hours longer or until meat is tender. , Remove roast; cool. Shred meat and return to sauce; heat through. Using a slotted spoon, fill each bun with about 1/2 cup of meat mixture.