Fuel Injection problems of the 1997 Chevrolet Monte Carlo

I bought this car Nov of 1999. I started experiencing problems with the car dying without warning anywhere from 30-70 mph. This is very dangerous because it has done it to me while crossing traffic to enter a parking lot. This vehicle has been to a dealer, central Chevrolet of north branch, to be fixed. They found several emission pcs bad and replaced. This did not correct the problem. It immediatly went back in and they have yet to find the problem. I was informed by gm that this car was repurchased back Feb 4 1998 and that this vehicle has had several repairs done to it and them being the same parts. I called them another day and they said that I was not to have gotten that info and they could help me no further with the problem. I would have never purchased this had I known the extent of the problems with it. It is April 5 2000 and my car is still not fixed! it is now at 2nd dealer, john hirshes of cambridge, who is not going to fix the car without the history of the repairs. Gm will not provide that info to anyone. Im trying to return the car to brookdale Honda because they did not tell me it was repurchased and also that the car cant be fixed. At least not by two of the local dealers. They dont know whats causing the engine to stall out and quit without warning. If you could help me with this problem, please do so. Please feel free to call if any additional info is needed. Thank you for the opportunity online to give this info to you so you may be able to help me.