Toss steak with flour until evenly coated; set aside.
Melt 1 Tbsp. of the margarine in large saucepan on medium-high heat. Add onions and peppers; cook and stir until crisp-tender. Remove vegetable mixture from pan; set aside. Add remaining 2 Tbsp. margarine to pan. Add steak, in batches; cook and stir until evenly browned.
Return all of the steak to pan along with the vegetable mixture; stir. Add steak sauce, beef broth and wine; mix well. Bring to boil; reduce heat to low. Simmer 30 min. or until steak is tender. Serve over rice.