1997 Pontiac Bonneville Fuel problem?

I have 97 pontiac bonneville. the problem i am having is that will run down the road it will begin to kind of stall out like it isnt getting gas and occassional will die. sometimes when i press the pedal really hard it cuts out and dies. I had the ignition module changed today thinking that would fix it and it didnt. now when you have it in park and rev it when it gets to about 8 rpms it begins to sound like it is chocking.
also another weird thing is sometimes when i am putting gas in it's like the tank is full but its not.