When grill is heated, carefully oil grill rack; place kabobs on gas grill over medium-high heat or on charcoal grill over medium-high coals. Brush plum sauce mixture over kabobs; cover grill. Cook 5 minutes. Turn kabobs; brush with sauce mixture. Cook covered 4 to 6 minutes longer, brushing frequently with sauce mixture, until pork is no longer pink in center. Discard any remaining sauce. If desired, serve with hot cooked instant white and wild rice.