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I think Mike has the timing down pretty good, but it really depends on how thick the shoulder is. Just put a probe in it and when it hits 200-205 check it for probe tenderness. Pulled pork is a big favorite around here too, but we usually get bone in butts.
Al
The rub is 2 tsp salt (I use celery salt) + 1 tsp each of pepper, fennell, mustard, onion, smoked paprika (regular will work), garlic, cumin and cilantro.