My truck just stops running when driving and than just turns over and will not start
Is the check engine light on? For that matter, I assume it comes on when the truck stalls? Have the accompanying code read, it might tell you what happened before the truck died.
Would an 85 Silverado been equipped with ODB 1?
When was your fuel filter changed last? I also wonder what the state of the fuel pump is
Unfortunately, you’re correct. A Silverado prior to '88 wouldn’t, it would have a “choke light” instead.