Trim excess fat from the pork.
Measure and mix dry ingredients.
Rub the spice mixture over the pork covering all sides.
In a cast iron skillet or heavy-bottomed skillet, warm olive oil using medium heat.
Place the pork in the heated skillet and sear each side 2 to 3 minutes, until golden brown.
Transfer seared pork and any drippings to crock pot.
Pour soda around the pork roast and add crock pot lid.
Cook for 8 hours on low, or 4-5 hours on high setting. Pork will be tender and easily shredded with a fork when ready.