In a small sauce pan boil pasilla chile and guajillo chiles until guajillo chile is soft. about 10 minutes.
Take chiles out, remove stems and seeds.
Place in blender with vinegar, orange juice, pineapple,garlic, onion, cumin, lime, chipotle, adobe sauce, vinegar, pineapple, salt, oregano, and sugar. Blend until smooth. Divide in to two.
Using an injector- inject ½ of the marinade into the pork.
Start by injecting your meat. Place in the needle and move it 4 different directions squirting marinade into each direction.
Continue this all over the pork shoulder until you have used about ½ the marinade OR you have put all that you can into the meat. Pour the remaining al pastor sauce over and under the pork butt.
Allow to marinate 4 hours to overnight.