Place chicken pieces in crockpot. Season with salt and pepper. Mix wine and soup; pour over chicken. Add mushrooms. Cover and cook on low 7 to 9 hours or on high for 3 to 4 hours. Remove cooked chicken pieces to warm serving platter. Stir together sour cream and flour, stir mixture into mushroom gravy in crockpot. Heat for 30 minutes on low. Serve sauce over chicken with rice, noodles or mashed potatoes.