To prepare pork, combine first 6 ingredients; sprinkle evenly over pork.
Place in a large zip-top plastic bag; seal and refrigerate 3 hours.
Preheat oven to 37
Remove pork from bag.
Place pork in a roasting pan; drizzle with oil.
Bake at 375 for 30 minutes or until a thermometer inserted in center of pork registers 15
Remove pork from pan; cover and let stand 10 minutes.
To prepare sauce, remove 2 teaspoons adobo sauce from can of chiles; reserve remaining chiles and sauce for another use.
Add 2 teaspoons adobo sauce, syrup, broth, and vinegar to roasting pan, scraping pan to loosen browned bits. Cook over medium heat 5 minutes, stirring constantly.
Remove from heat.
Place pork in pan, turning to coat.
Remove pork from pan, reserving sauce in pan.
Cut pork into 1/2-inch-thick slices. Strain sauce through a fine sieve into a bowl; serve with pork.