my car ever since i removed my resonator has had a hard time idling it at idle my car will start to sputter a little bit and if i tap the gas it goes away for a little bit then comes back what could this posible be? please help

Could maybe be a problem with the O2 sensor, if you have a little exhaust leak you may be getting false readings to one of you O2's... Just a guess but if you have access to a scan tool (or a DVOM meter) it would be easy to tell.

-Jeff-