Combine salt, brown sugar, chili powder, paprika, garlic powder, cayenne pepper and black pepper in a small bowl for the spice rub.
Cut the rack o ribs into 4 equal portions and rub all sides well with the spice rub.
Pour broth into the instant pot. Add the ribs in a teepee formation, close and lock lid. Select High Pressure Cooking for 30 minutes. Allow 15 minutes for pressure to build.
Pre heat oven to 425 degrees and line a baking sheet with aluminum foil. Release pressure on instant pot using quick release method, about 5 minutes. Remove ribs and put on baking sheet. Brush all ribs with BBQ sauce. Bake in pre-heated oven for 7 minutes. Turn ribs and continue baking until meat pulls away from bone or about 7 minutes more until browned.
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