Roast Beef and Sour Cream Gravy Crock Pot Recipe

1 (3 lb) chuck or pot roast
2 tablespoons flour
1 teaspoon salt
1/4 teaspoon pepper
1 tablespoon oil
1/4 cup water
1 tablespoon vinegar
5 or 6 small potatoes
5 or 6 carrots
1/2 teaspoon salt
1 large onion
1 tablespoon flour
1 cup sour cream

Coat roast with 2 tablespoons flour, salt and pepper. Brown in oil in skillet. Put roast in crockpot. Add water and vinegar. Add potatoes, carrots, onion and salt. Cook on LOW for 10 to 12 hours or on HIGH for 6 hours. To make a gravy, pour off 3 tablespoons of drippings, add 1 tablespoon flour and heat. Measure rest of drippings, and add water to make 1 cup. Add to flour mixture and heat for 1 minute, stirring constantly. Add sour cream. Heat to boiling.