Newf

my 2001 neon sems to have an extremely rough/low idle that almost stalls the car sometimes. i get the stalling mainly on hills. i wasted money on replacing the idle motor but that did not fix my problem. i have also installed new wires, plugs, coil and air filter with the tornado fuel saver insert. any ideas what could be wrong? as well is it possible i need a new fuel filter or fuel injectors? thanks