For sauce, in a small bowl stir together chicken broth, vinegar, soy sauce, sugar, cornstarch, and garlic; set aside.
In a large nonstick skillet cook and stir carrots and sweet pepper in 3 teaspoons of the hot oil over medium-high heat for 3 minutes. Add pea pods. Cook and stir about 1 minute more or until vegetables are crisp-tender. Remove from skillet; set aside.
Add remaining 1 teaspoon oil to skillet. Add chicken to skillet. Cook and stir for 3 to 4 minutes or until chicken is no longer pink. Push chicken from center of skillet. Stir sauce; add to center of skillet. Cook and stir until thickened and bubbly. Add vegetable mixture and pineapple chunks; heat through. Serve with hot cooked brown rice. Makes 6 servings.