Engine stop while driving the engine stop. I waited for 30 minutes and will start.

Radiator cooling fans not working? The ECM is protecting the engine by shutting it down.

Drive Cycle resets to reset the OBDII testing phases are very specialized to the year, model and engine of your car. So I can only speak generally. Start the car from fully cold and let it idle for about 15 minutes, then put the car into gear and drive it for about 5 minutes at 35 mph, then get on a highway and drive at about 60 mph for 15 minutes, come off the highway and drive around 40 mph for 3 minutes, come to a complete stop (like a stop sign) wait 30 seconds, drive off again up to 40 mph for 4 minutes - and repeat the last 2 steps (going up to 40 mph) about 3-5 times. Then repeat the last two steps going up to only 25 mph. Then come to a complete stop in your driveway and let the car idle for 10 minutes with the a/c on . After this is done, hook up a code scanner and see if it reset the modes to "ready".

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Sounds like hot soak problem on solenoid or maybe starter relay.

run fault codes and check for ambient air temperature sensor fault and check gear box for sensor/servo problems

Sounds like your coolant level might be low. At highway speed you probably have enough coolant and with the air passing thru the radiator keeps the temp down, but at idle not so much. Or depending whether you have a belt drive or electric fan. Belt driven, could need a new belt.

Check for fuel pressure and check for spark during the no start condition. Also check the crank sensor, it is located behind the crank pulley mounted in the engine block on the 4.3 L engine
I hope this helps.

Did you get fuel recently, might have something in fuel e.g water? or even the fuel filter getting clogged.

I just recently have been fighting the same problem with the same make/model/year vehicle. For myself, I would drive off and on through the day and it would run fine. Then suddenly after a start it would run rough and die. I would have to wait 20 to 60 mins before it would start again. I had it checked and fuel pump was only putting out around 19 psi. It should be around 41 psi. Had fuel pump replaced and no more problems. Furthermore, now it runs so much better. It's funny how over time I didn't notice how the performance was slowly degrading. Unfortunaley fuel pumps for this car run around $300.

possible fuel pump. Try spraying starting fluid into breather while someone is cranking engine. if vehicle tries to run it is fuel problem. If not it could be an electrical componet overheating and cooling and restarting. Coils, relays, ecm.

Hi! Try to check the battery terminal it might loose try to fix it and make sure to tighten the battery terminal.

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