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SOUNDS LIKE THE FIRST STAGES OF AN ELECTRIC FUEL PUMP FAILING. THEY ARE NOTORIOUS FOR THESE TYPES OF SYMPTOMS. THE LOW PRESSURE AT THE TRAFFIC LIGHT RESULTS IN THE STALL, BUT AS LONG AS ITS UNDER DEMAND IT WILL FUNCTION OK UNTIL IT QQUITS. HAVE A PRESSURE CHECK DONE ON THE FUEL PUMP
For this vehicle to stall out and allow for a restart the most probable is the TPS(throttle position sensors),the next can be a EGR, when you traveling on the road and you make a stop if the EGR puntle doesnt close properly the vehicle will stumble and you stall out, then there is the low fuel pressure this can be caused by fuel pump or plugged filter,then you may have a IAC(idle air control) the idle control maintains the proper engine speed to prevent stalling,There are many probable causes of stalling out each has it own unique characteristic this depends on the condition in which a load (in gear) was placed on the vehicle or no load. also how you stall and are you able to restart the moment you stall out, or do you have to waith till the engine is cool before you can restart, there are many factor that are involved
Sounds like a weak power cable somewhere... either a partly blown fusible link, or a bad connection that has grown over time to become the issue it is today....I do not know if, when the car stops, does the entire vehicle power goes out, meaning that there are no lights (idiot lights in the dash, service engine, check engine, etc).. If absolutely no lights are visible anywhere, then I would hazard a guess that there is an issue with the power cable coming off of the battery terminal, or alternator (generator) problem. I can't really give you more than that with out more information. for an example, is the "power off" issue, repeatable under the exact same circumstances? Can it be repeated every time you try to repeat it or is it something that is just happening when ever it feels like it?
when it stalls does it start right back up or do you have to wait awhile. if it stalls and wont start check for spark at the spark plugs and for fuel pressure. a common problem is the ignition module. it could even be a dirty throttle body if it is stalling at the stop sign then starts right back up. Check your air filter and the throttle body. If the throttle body has a bunch of carbon build up your car wont get enough air at idle. same will happen if you have a super dirty air filter. If the ignition module is bad the symtoms are usually that it wont start for a while till it cools down then will restart.
If the scan will narrow down which o2 sensor it is and replace it. If it has more than one on that year that is. Under load you will probable have a richer fuel mix. If the sensor is going going bad it may only get out of spec reading under heavy load and warmer temps. I have had similar issues with GM and it was easily fixed.