1. Prepare grill.
2. Combine first 7 ingredients in a small saucepan; bring to a boil. Reduce heat, and simmer, uncovered, 5 minutes. Set aside 1/2 cup sauce; keep warm.
3. Coat grill rack with cooking spray; place on grill over medium-hot coals (350° to 400°). Place chicken, bone side up, on rack; grill, covered, 8 minutes on each side or until done, turning once and basting with remaining barbecue sauce. Serve with reserved 1/2 cup barbecue sauce.