Heres the deal...When the car is cold, it runs fine no sputtering or anything. Once the car is warm it starts to sputter around 2k to 3k rpms, once its out of that rpm band the car runs fine. I have checked alot of stuff:

Injectors are ticking
Headgasket is fine
Fuel Pump is priming
New distributor/cap/rotor
recent plugs and wires
New Fuel Filter

Any suggestions...I honestly thought it was the fuel filter, but i replaced it today and its still doing the same thing. Im running out of options here.....