need help!!

well heres the thing, i have a 94 Z24 cavy with a 3.1 so far i have replaced, the fuel pump, fuel filter, plugs,plug wires,coil packs, 02 sensor and i ran a bottle of fuel injection cleaner through it. but for what every reason it will idle fine, but when i put it to the floor it dies. if i pump the gas i can get it going and after it warms up it will run half way decent. but if i put it to the floor it still dies. i've also hollowed out the cat. i can get it to like 70 and it will go i just can't floor it. does anyone have any idea as to what the hell the problem is?