1991 pickup ¾ ton 350 engine just stopped running.
I Replaced:

Cap & Rotor
Then tried to start and got nothing

So I replaced
Ignition control module
Then she started for 10 minutes

So I replaced
Fuel filter
Air filter

She still will only run for about 10 minutes then shuts off and won’t start again for hours.

I can spray starter fluid in carb and get nothing. So I am thinking ignition not fuel.

I do get trouble code 15 Coolant temperature sensor faulty

What to do next?