1993 chevy k1500 blazer 5.7 auto. Truck shuts off when it reaches running temp

Yes fuel pressure is good and Icm tested good twice at two different times places

When it stalls .. Test for ignition fire .. Got spark?

Yes still have spark but no injector impulse.

Since fuel reassure has been tested using a test gauge and 'IF' injector pulse has been tested and confirmed that's the problem .. Replace the distributor 'assembly'...

But when it sits for 3 to 4 hours I can drive again for 10 more minutes.

Yep .. That sounds about right!! .. Distributor also signals injectors... Module probably did test good... That doesn't mean much! .. Still got the same pick-up coil in dist .. Plus that module circuit may break down on running engine but still produce spark .. All this is based on the information I have been given here > fuel pressure test gauge was used for testing and injector pulse signal was tested with noid light or test light as well. Good luck with it!