• Cut the pork ribs into smaller sections of 3 to 4 ribs so they fit inside the pot. 
• In a small bowl, combine the brown sugar, garlic powder, onion powder, seasoning salt, and chili powder. Rub the seasoning blend all over the ribs.
• Place a rack in the Instant Pot and pour in the water and vinegar. Place the ribs on the rack.
• Secure the lid and place the valve in the sealed position.
• Cook on high pressure for 25 minutes. 
• Allow the Instant Pot to release pressure naturally for at least 10 minutes then release the rest of the pressure manually. 
• Remove the ribs from the pot and baste with barbecue sauce. 

For thick caramelized BBQ sauce:

• Turn your oven on broil and place the oven rack 6 inches below the broiler unit. Place the basted ribs on a baking sheet and put them under the broiler for 2 to 4 minutes.