s13 wont idle PLEASE HELP

[Adam240sx]

ok, heres the deal....my 240sx wont hold a idle.....like i can start it and it dies right away......i've already changed the fuel pump,fuel filter,spark plugs(denso), i had the bosch platinum 4's in there, but after talking to a friend i removed them.....i was wondering if mabey a bad o2 sensor would cause her not to idle?.....she'll run if i keep my foot on the gas....but thats it.....please help me out im so lost as to what could be wrong...???

thanks very much 240sx.org/members