Cut pork into cubes. Combine the 3 tbsp. of flour, salt, thyme and pepper and toss with meat. Put carrots, potatoes, onion and apple in Crock-Pot. Top with meat cubes. Combine the apple cider and vinegar; pour over meat. Cover and cook on low for 8 to 1 0 hours. Turn Crock-Pot to high. Combine 1/4 cup flour and 1/2 cup cold water and blend well. Stir into liquid in Crock-Pot. Cover and cook 15 to 20 minutes or until thickened. Season to taste.