Mix barbecue sauce, hot pepper sauce and garlic powder. Reserve 1/2 cup of the barbecue sauce mixture for serving with cooked ribs.
Place ribs, bone sides down, on grate of grill. Cook, uncovered, 1 hour, turning over after 30 minutes.
Brush with the some of the remaining barbecue sauce mixture; continue grilling 30 minutes or until ribs are cooked through, turning and brushing with the remaining barbecue sauce mixture every 10 minutes.
Serve with the reserved 1/2 cup barbecue sauce mixture.
