Combine the chicken, ketchup, vinegar, sugar, molasses, Worcestershire, mustard, garlic, 1/2 teaspoon salt and 1/4 teaspoon pepper in a large resealable plastic bag and shake to combine. Squeeze out the air from the bag and seal. Freeze until ready to use, up to 3 months. Thaw in the refrigerator for at least 24 hours before cooking.
Pour the contents of the plastic bag in a 6-quart slow cooker. Cook on low until the meat is tender, 5 to 7 hours. Shred the chicken with a fork and toss it in the cooking liquid.
Divide the chicken among the 4 buns and top with coleslaw and pickles. Serve with potato chips.
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