MIX steak sauce and chipotle peppers in large bowl. Add meat; toss to evenly coat with sauce. Refrigerate 30 min. to marinate. Meanwhile, mix sour cream and lime juice. Refrigerate until ready to use.
REMOVE meat from marinade; discard marinade. Heat 1 Tbsp. oil in large skillet on medium-high heat. Add meat, in batches; cook and stir 3 min. or until evenly browned. Remove from skillet; cover to keep warm. Add remaining oil, green peppers, red peppers and onions to skillet; cook and stir 3 to 4 min. or until vegetable are crisp-tender.
RETURN meat to skillet; stir. Cook 5 min. or until heated through, stirring occasionally. Spoon down centers of tortillas; top with sour cream mixture. Roll up.