I have a 97 blazer starts fine stalls at 230deg starts when cool

Sounds as if the ignition control module is getting hot and not allowing it to restart. Had the same issue with a Dodge b-250 van, except for the plowing part. It would run for about an hour and start sputtering and shut off. After it cooled down, van would start and run great for the same length of time and do it again.

Try changing or switching out the distributor. Most likely getting hot and shuts down. Does it crank but no start whenever it stops? May only start when it cools down again.

Has anyone checked base fuel pressure with a gauge ?

I would say your starter is faulty. Since the vehicle runs fine, and doesn't start up after being shut off until it has cooled down, it sounds more like a starter that loses contact when it is hot. You could check the starter terminals for 12 volts using a multimeter when the key is turned to Start the engine after warming up the engine and shutting it off. If 12 volts are present, replace the starter. If 12 volts are not present, check the Starter relay.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Sounds like the "Crank Position Sensor"...especially because it will start fine a few minutes later...tough to confirm by codes on this one...do any of your gauges go beserk when your Buick stalled? This would again point to the same intermittent starting and running problem...part is about $35. May need help to install...:)

its common for chevy vehicles-you have a problem with your crank positioning sensor,our 06' colorado does that- sensor maybe $50.00,look into that sensor..
hope that helps you-good luck!

Might try a new fuel cap.

Sounds like it is fuel related. Ck fuel pressure to be sure. Also ck the pressure regulator on the fuel rail, It is a small metal cylinder at the end of the fuel rail to ck pull to vacumn line off (hot not running after shutting the engine off). If there is fuel in the vacumn line it is bad. Good luck

97 don't have carb that year its TBI injection . Inspect/fuelpump relay/pressurereg.switch/pump/filter

I have a '81 Firebired that did the same thing with the factory-issued Flintstone-mobile 3.8L V6. Everything but the starter worked correctly: new 185 thermostat, perfect 50-50 coolant misture, no leaks, etc., but still had to wait 1-2 hours for a cool down.

It may be that your original starter is dying. Your starter relay is over-heating and opening the circuit. You can replace the starter and/or buy a pre-made heat shield for the starter or fab one yourself. Regardless, just remember that the goal is to keep the starter as cool as possible.

To prove this is in fact the problem get the engine hotter than usual in your driveway then shut it off. If it won't start cool it down with a bag of ice (don't burn yourself). Should take less than 5 minutes to cool it to start.

Good luck!