Gee, that narrows it down.
It is an automatic. This truck has a lot of use on it, it is all either idling or hard driving with no warming up. I'm afraid I might have to have a mechanic evaluate it. I'm just hoping to get an idea of the possible problems here so I know what we are getting into. If this thing is going to blow up in a month, I need to start planning an new EMS Rescue truck.