Being a new egger, I believe I made a mistake. I have been using a lump charcoal I bought from the Grill Store where I bought my egg. I ran out of that lump, and the grill store was sold out, so I went to the grocery store and bought a different lump charcoal (Natures Valley Mesquite). I found that there were 1 or 2 huge branches, that I tried to break up, and the majority of the bag were tiny pieces. I used the new coal for my first low and slow. I had a difficult time getting it and keeping it at temp. After I stabalized for about an hour, I went to bed. I checked it after about 5 hours and found the coals were out and the grill was cold. I lost a $14 butt but learned bigger lesson. My guess is that all of the small pieces clogged the air holes. Also, the lump I was using before was charcoal from mills. Does anyone have any preference whether they use charcoal from mills or natural wood?