My car will shut off when I let off of the gas pedal. Why?

What is your question?

I drive an 02 Pontiac Bonneville with a 3.8 engine (not supercharged). When you turn the key the car will start but will instantly die unless you press down on the gas pedal. If you press the gas pedal down the car will run but will die when you let off of the gas. I have been told that it is my fuel filter, my fuel pump, my catalytic converter, and my Bank 2 O2 sensor. What could this be?