I stalled out last week when it was -4 here in NE Ohio. My dodge truck was well warmed up and running fine. Started to miss then quit. Had it towed to a diesel specialist and after sitting in his warm shop all weekend it started right up and ran great. After checking out some mechanical things he pronounced the diagnosis as gelled fuel and recomended an antigel agent. All the local pumps advertise that they have anti-gel additives already mixed. What gives??