This is the first time I've attempted to slow smoke ribs, I set the temp just over 200 at 7 AM with the plate setter in the leg up position. I kept checking the temp until we left for church at a little after 10 and it stayed spot on. When we got home, I went out and the temp was down below 150. I do need a new gasket, I haven't been to the dealer to get one, is that the reason the temp dropped? I understand you aren't supposed to have to do anything once you get the temp where you want it for up to 24 hours. I was wondering if every now and then I should have opened the vents up to give it a little more air? I really am new to this, the ribs were fabulous anyway and hubby doesn't even like ribs!