Combine all ingredients, except pork roast. Put pork roast in large= plastic bag (or plastic container). Pour marinade over pork. Marinate at= least 4 hours in refrigerator, or overnight. Remove pork roast from= marinade, reserving marinade. Grill covered (or bake at 350 degrees) for= 30 minutes per pound, basting occasionally. Simmer remaining marinade for= at least 5 minutes, serve drizzled over sliced roast.