COOK and stir steak in hot oil in large skillet on medium-high heat 3 minutes. Add peppers and onion; cook 3 to 4 minutes or until steak is cooked through and vegetables are crisp-tender, stirring frequently.
ADD salsa and marinade; mix well. Reduce heat to medium-low. Cook until heated through, stirring occasionally.
SPOON evenly onto tortillas; roll up. Top with the guacamole and sour cream.