In a skillet over medium-high heat, brown pork chops on both sides in oil; drain. Combine the orange juice, brown sugar, marmalade and vinegar; pour over chops. Bring to a boil. Reduce heat; cover and simmer for 14-18 minutes or until meat juices run clear.
Remove chops and keep warm. Combine cornstarch and water until smooth; stir into pan juices. Bring to a boil; cook and stir for 2 minutes or until thickened. Season with salt and pepper. Serve with chops.