Trim fat from pork roast and cut into 4 same size chunks.
Season pork roast chunks well with Magic Rub.
Add 2 tbs olive oil to Instant Pot and set to saute. Once it indicates hot, add 2 pieces of the pork. Sear on each side for about 2 minutes each. Remove pork and set aside on a plate. Repeat with remaining pork pieces.
Once the pork is seared and removed from the pot, press cancel and add, chicken broth, orange juice, and brown sugar to the pot. Use a wooden spoon and deglaze the bottom of the pot. Make sure to scrape up all the bits. Then add Worcestershire sauce and liquid smoke.
Place pork chunks directly into the liquid in the pot, spacing out as best possible. Secure lid and make sure the vent is set to sealing. Pressure cook/manual on high pressure for 1 hour and 30 minutes. Then let the pressure release naturally until pin drops.
Remove pork and place in a large bowl and shred with 2 forks. Hold reserve juices for later.
Place shredded pork back in the pot add your favorite BBQ sauce, some reserved juice, and cook for 20 more minutes.
Serve it up! We love coleslaw or Homemade French Fries with ours.