Mix garlic powder, crushed cayenne pepper, chili powder, smoked paprika, pepper, onion powder, salt, and brown sugar together and set aside.
With ribs cut off excess fat and score the bottom of the ribs.
Rub season all over ribs evenly, can be used up to two racks of ribs.
Vacuum seal and refrigerate for 2 hours. If you don’t have a vacuum sealer wrap ribs tightly and refrigerate for 3 hours to overnight.
With rack in an instant pot pour 1 cup of beef stock and ¼ cup of white vinegar into the instant pot.
Wrap the ribs meat side out in a circle on the rack, close instant pot.
Pressure cook - high - 25 minutes
Quick release according to manual * some instant pots might be different *
Line a baking sheet with tinfoil and place ribs down meat side up. With 2 cups of BBQ sauce evenly brush some onto the ribs.
Broil for 4-6 minutes.
Cut and serve immediately with the leftover BBQ sauce