Cut pork into 4 chunks and place pork in instant pot.
POur over chicken broth, orange juice, and lime juice.
Sprinkle in salt, pepper, cumin, oregano, coriander, chili powder, cayenne pepper, onions, and garlic.
Cover and seal lid. Make sure valve is set to sealing position. Press manual or high pressure and select 60 minutes.
Once cooking is done, let pressure come down naturally for 10 minutes. Then use quick release method to release any remaining pressure.
Once steaming has stopped remove pork from pressure cooker while leaving broth in pressure cooker.
Shred pork and grease a 9x13 inch baking sheet.
Place pork on baking sheet, pour over 1 cup reserved broth (try and strain out onions). Drizzle with oil and toss and spread into an even layer.
Position in rack near broiler and preheat broiler to high.
Broil until pork is browned and crispy in places--about 3 to 6 minutes.