Originally Posted by HankB
Early in he cook it is normal to see the grate temperature higher than the lid thermometer. The lid has all of the cold meat between it and the fire and that affects the reading. As the cook proceeds, they will usually read closer because the meat heats up.
Of course this assumes all probes are reading correctly, but the readings you are seeing are not at all unusual.
Its almost 5 hrs in. I have been watching it the whole time. It was at 134 then within 4min or less it was at around 280. I have not messed with the lid or vents since i put the butts on.