1997 Ford Truck engine electrical

Sounds like a temperature related situation that can be sometimes flushed out by cooling down with a damp washcloth that is put into the freezer prior to the expected no start. Put the washcloth on a suspected item and it will cool it down. If it restarts, you found your problem. Conversely you can use a hairdryer to heat a component when it cold to create a no start.
Assuming this is a loss of spark. Use a spark tester to verify this is what is missing.

Not sure which engine or particular truck you have and assuming there are multiple coil packs, I would lean away from all coils going bad at once. Misfires would be more of an expected results. A weak ignition module
would be more likley as the coils get the power from it.

Are there any codes stored in the pcm?