YouTube has the answer to everything BBQ Ribs on a Gas Grill
This guy knows what he is talking about. IMO, charcoal/wood would be the best option, but your ribs should turnout damned good if you follow the video I posted.
ha, thats awesome. Thats almost exactly what I do with my ribs, but in the oven, since I don't have a smoker yet.
Make a nice rub with some herbs like sage or thyme cheyenne pepper etc. Put them on a two layer oven plate with all the juice from the meat in the bottom and then add a little water make a tent out of foil for the whole thing and then bake them at 175-200 for 2 hours or so then the last 30 minutes i take the tinfoil off. Then throw them on the grill with some homemade BBQ sauce, they are pretty amazing.