I'm glad to know Planeteers are using the site. I found it 6 years ago.
The barbecue stall is a simple consequence of evaporative cooling by the meat's own moisture, slowly released over hours from within it's core . As the temperature rises, the evaporation rate increases - until the cooling effect balances the heat input. Then it stalls, until the last drop of moisture is gone. Adding moisture to the pan or injecting the meat increases the length of stall but also makes the meat more juicy. I frequently use Coke in the bottom of a disposable pan along with the pork shoulder. The Coke acts to tenderize the meat in a way apple juice can't although I have also used half coke and half pineapple juice (rich in papain, a proteolytic enzyme) or half pineapple juice and half apple juice very successfully. At 150 degrees meat temp I always use the Texas crutch - wrap in foil tightly - to shorten the stall at low temps. I use 220 degrees as my target for the smoker temperature so that's very low. Some people use higher temps and get great results but I've found the meat has to be watched very closely or it comes out dry when using temperatures above 275.
I also always wrap my meat too, my moms trick. I'll have to try the pineapple juice. Can I leave out the coke though? I also generally slow cook at the lower temps unless I'm pressed for time.
~Dee~