All of a sudden my stove is struggling with the primary air wide open. I can't get past 400 on the stove top and the cat can't get past 700. I don't think the cat is even lighting off because it isn't glowing and there is smoke coming out of the chimney. This is crazy. Just a few weeks ago it seemed my stove was out of control and had to keep the primary nearly shut. What could be causing this? I am using the same exact fuel.