I just bought an 2003 cobra and have only done a mac straight shot cold air kit and an upr off road x pipe with mac catback exhuast. I just went out today and bought an sct handheld tuner to try and make the car run a little better down low. The car seems to have a mild hickup from idle to about 2000 rpms when idling or holding the throttle steady at 1500 to 2000. Does anybody have any suggestions on how to cure the issue?