In a small bowl, whisk together brown sugar, mustard, chicken broth, and apple cider vinegar. Set aside,
Heat your Instant Pot to saute. When the display read HOT, add oil to the pot.
Sprinkle salt and pepper all over the pork and arrange in the bottom of the instant pot. Cook 4-5 minutes, turning to brown on all sides.
Turn off the saute function and pour the vinegar mixture over the pork. Put the lid on the instant pot and turn to seal. Set the timer to cook for 35 minutes on high pressure. When timer beeps, let naturally release for 10-15 minutes, then do a quick release.
Once pressure is released, open the lid and transfer the meat to a cutting board or bowl and shred with two forks. Add BBQ sauce and serve as sandwiches, on top of baked potatoes or in wraps.