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To prepare pork, combine first 8 ingredients (through chipotle chili powder) in a small bowl.  Rub mixture evenly over pork.  Let pork stand at room temperature 1 hour.

Place pork in the Crock Pot and pour 1 cup water.  Turn Crock Pot on to medium and cook for 1 hour.

Turn heat down to low.  Combine 1/2 cup vinegar and ketchup in a medium bowl; brush pork with ketchup mixture.  Cook an additional 3 hours, basting every hour with ketchup mixture.

Pour remaining 1 cup water in Crock Pot, if needed, and cook and additional 3 1/2 hours or until thermometer register 190-degrees.  Turn off heat and let stand for 45 minutes.  Shred pork with 2 forks.

To prepare sauce, combine 3/4 cup vinegar and remaining ingredients in a small saucepan.  Bring to a boil over medium-high heat, stirring occassionally with a whisk.  Boil 5 minutes or until slightly thick.