Does anyone know if an 04 G35 has an idle air control valve? Been trying to fix an issue.

 

Nope, just an algorithm called "idle air volume", you calibrate it by following the steps in the FSM under section EC - Engine Controls under "basic service procedures" at the start of the document.

BTW it's easiest to calibrate the idle air volume by using the Android app Nissan Datascan 2, gotta have a bluetooth OBD2 adapter, I personally recommend this one sold on Amazon made by BAFX. It has all the OBD2 protocols including ISO 9141-2 which is what the G35 uses.