CAR DIES AT STOP LITE W/ AC ON, AND SOMTIMES WHILE DRIVING AROUND 50MPH. HAS 3800 TP INJECTION ENGINE.
Does the CEL come on when the engine dies?
You probably get all kinds of warning lights come on when the engine stops but look for the CEL.
It may be holding a code. If there is one, post it here and let the techs carry the ball.
When it dies, does it simply quit as though the key was turned off or does it sputter and stumble to a stop?