At the request of some relatives visiting from Arizona, I am doing pulled pork for tomorrow evening. Since nobody will be home tomorrow after around 10AM, I started the cook at 4:00 today. My dome temperature had been rock steady for the first hour and a half and at 5:30 it was sitting comfortably at 225. We left for a meeting at that time and just returned to find the dome at 300! I just turned my head for a second.... No more than a sliver of an opening at the bottom vent. I will not sleep well tonight out of fear of teetering on the verge of extinguishing the fire, and allowing too much air to get to it and seeing the temperature rocket. Not good.