In a cup, combine cumin, cayenne pepper, salt and chili powder; rub mixture on both sides of pork chops. In a large zipper-topped plastic bag, smoosh together remaining ingredients (salsa through lime juice); add seasoned pork chops, seal bag and turn to coat. Refrigerate overnight or for at least 1 hour. Preheat outdoor or indoor grill; cook pork chops for 5 to 8 minutes or until done.