Add pork loin to slow cooker. Add Coca-Cola and apple cider vinegar and stir. Sprinkle the top of the roast evenly with salt, pepper, garlic and chili powder. Cover and cook on low for 6 to 8 hours or on high for 4 hours or until pork is tender and cooked through.
Remove from liquid and allow to cool slightly. Roast can be pulled or sliced.