Ok the IAC-Idle air contol valve-it alows air to bypass the throttle plate and then regulates this air to control idle. this is located on the TB is the largest of the sensors.
One of my friends cars was having a problem like this and where we would have to give it gas to keep it alive it turned out to be a bad Map sensor and a Throttle position sensor.
IF the car has a service engine light on take it to autozone and they will pull the codes for u
stage 4 clutch, aluminum flywheel, solid motor mounts, Phantom grip, phantom boost, egt, a/f, oil psi, apexi TT, Jeep TB, Star stage 2 with custom 3 inch downpipe out passenger side bumper, custom ground kit, falcon azenis, 2 inch drop, eibach camber kit, crank scrapper,AEM cam gear, short shifter, AFX UDP and some other stuff