When the outside temperature gets above 70 degrees it stalls and dies.  During the winter it worked fine.

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a faulty engine coolant temperature will cause vechicle to stall out during climate changing.

give them a different car. trade it in.....

could be a bad thermostat control or temp sensor.My international car carrier did the same thing.It was called a thermostat control on it.Different manufacturers hav e different names for it.basicly it reads temperatures

I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital temperature on the climate control is not correct. When it states that it is below 30 degrees on the ext and it is warm outside the air wont be cold. Once it starts going above 30 degrees the air gets colder. Today the blower stop working all together. Was told it maybe the climate control unit was bad. You can hear the door opening/shutting when you switch the temp from cold to hot. But there was no heat blowing out whatsoever in the winter time. Could you please give me your opinion on whether or not it is the climate control unit or something else?

What does it do, if you try to accelerate when this starts to happen? If it dies,sputters or is sluggish, I'd start by changing fuel filter, and if that doesn't help, have fuel pressure tested when (if at all possible) this begins to happen. Had similar problem, winter was fine, hot weather it would die, and restart after 20 minutes or so, then go a fair distance again, then same thing. Fuel pump was on it's way out and when it got hot, fuel pressure would drop. First thing in the morning when fuel in tank and pump was cool, ran like a charm, but on way home from work, after sitting on a hot day, fuel got warm/hot, and pump heated up and that's when it started. Carried a fuel pressure gauge with me. Fuel pressure when cool, was 49 psi, and when it got hot, eventually dropped off to 2 psi. Sat for 20 minutes, jumped back up to 49psi, took off for home,then would eventually get lower and die again. Changed pump and filter, all was well. Try filter first, you have nothing to lose, and it should be changed if pump replaced later anyway.

Those cars are bad about the cam sensors going bad wouldnt hurt to repalce as good maintenance.

First thing to do is find out what is missing when it dies, spark and plugs or fuel at the injector.
The next time it dies out, have him pull a spark plug wire off, crank the engine over and see if the ignition system makes a nice snapping spark. If that is good, you will want to get a fuel gauge and install it and test the fuel pressure, should be around 30 psi. Once you figure out which one it is we can go from there.
Good luck.
Regards,

Check your air filter is not clogged, also veriy the air mass sensor.

heat build up causing spark system to break down

tell tale sign is highway drive is fine (plenty of cool air under hood)

you may have spark module prelim failure
it'll only get worse eventually it won't run but a few minutes