Getting ready to cook a couple of pork tenderloins and the coals are not seeming to want to stay lite right. I cooked for the first time on Wednesday and the coals lite fine, but not sure what the problem is now. Also when I tried to calibrate my temp gage I got it set to 212 when water boils, but now it is just stuck on 100 when its taken out of the water. What's my problem??