Heat the oven to 375°F and spread 3/4 cup enchilada sauce across a 9-by-13-inch baking dish.
Mix the pork, green chiles, 1 cup cheese, onion, cumin and salt.
Wrap the tortillas in damp paper towels and microwave 45 seconds until flexible.
Divide the pork filling among the tortillas, roll them snugly and arrange them seam-side down in the dish.
Whisk the remaining enchilada sauce with the sour cream and spoon it over the rolls.
Sprinkle with the remaining cheese and bake until bubbling and lightly browned, 25 to 30 minutes.
Rest the enchiladas for 8 minutes before lifting them from the pan.