Truck started spitting and spuddering. Need advice asap

^id like to know also. There's a couple fleets we maintain and we always have constant gel problems during the winter and we use ps, but we know a lot of the drivers don't care and don't put it in when they fill up. Maybe I can get them to try another fuel treatment next year to see if that helps.

The only time my truck gelled was last year when it was negative 20 or worse. Filters completely froze and it wouldn't start at all. All the trucks that come into the shop that are gelled wont start either. I havnt seen on that was running, driving, and still idled like what mine did.
 
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