With all due respect, that's not barbecuing.

You can get the same or better effect if you marinate the ribs for at least a day in the fridge, then parboil them, apply the rub, and then put them on the barbecue grill to finish. If you feel that you must, put the sauce on shortly before you pull them off the grill. Sensible persons will apply a finished sauce on the ribs after it comes off the grill--