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This has happened to me very time I do a long cook.
I stabilized my egg, put in the drip pan and added 2 cans of beer, and added the meat. Of course with the lid open the thermo drops. It came back up but now is higher thanthe origianl setting of 275. I have pretty much closed the daisy wheel and the bottom vent is a 1/4 inch open and still no drop in temp.
I dont want to shut everything downa nd snuff the coals. What can I do to remedy this everytime I go low and slow.