In a medium saucepan, combine enchilada sauce, Coke, brown sugar and Sriracha sauce. Cook over medium heat until reduced thickened enough to coat the back of a spoon. Remove from heat. Set aside ¼ cup of sauce. Add pulled pork to the remainder of the sauce and toss to coat the pulled pork.
Prepare pork roast according to recipe directions. Pull apart with two forks. Set aside.