So I'm preheating my LGE for todays cook which 3 racks of Spares. The stoker gets the temp up to target and of course the there is smoke everywhere. The stoker shuts off and then kicks in a couple of times real quick to just give a burst of air. All the sudden there is this huge rumble inside the egg that literally shakes it and it's table followed by a lot of smoke. It did this about 3 times.
Any ideas what is going on? The firebox is full and there is a bunch of old lump inside. Also, the fresh lump I put in is mostly small pieces as I am finishing off a bag but I didnt use the crumbs in the bottom.