To cook pork ribs on a gas grill you will need to set the grill for indirect heat. That means to only turn on half the grill. Wrap the ribs in aluminum foil after seasoning. Place on the unlit side and close the lid. Grill for 1 1/2 to 2 hours. To make them really yummy add BBQ sauce. Take ribs out of the foil, brush on the sauce and continue to grill on the direct heat side for another 15 to 20 minutes.