I usually slow roast bbback ribs in the oven, seasoned with just a little salt and pepper for at least a couple of hours (225) before I slather on the sauce and finish on the grill at a low flame. The inside of the meat becomes very tender and the grilled outside is caramelized and not burned. It is important to use a very moderate flame when doing the final grilling to avoid burning the sauce and ending up with blackened ribs.
If you are par cooking the ribs I would recommend a lower temperature, 225°, using indirect heat on the grill. When the ribs start to pull away from the bones, take them off the grill. While they are still warm wrap them individually in plastic wrap and then aluminum foil. Either place them in an oven set at 160°, or in an empty Thermos type cooler to stay warm. They can stay warm for an hour without getting concerned. When you need them finished remove the foil and plastic and return them to the grill.
Warm them over direct heat to give them a little char and smoky flavor. If you sauce them, do so over indirect heat so the sauce does not burn. This method is used in most of the BBQ rib competitions.
If you GRILL ribs for 2/12 hours, they will be burnt on the outside, and likely not cooked through. We've always par-cooked ribs in the oven (covered) and then finished them on the grill. (imho the best way to do them would be in a smoker, low and slow, but I don't have one, and neither do most of the folks I know.)
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Warm them over direct heat to give them a little char and smoky flavor. If you sauce them, do so over indirect heat so the sauce does not burn. This method is used in most of the BBQ rib competitions.