GTi-R B13 Running Rich HELP!

[Epic_SE-R]

http://www.youtube.com/watch?v=U94mwZJ815Q
B13 Harness, GTi-R ECU, MAF, O2, resistor pack. Adjustable fuel pressure regulator, set at 38 psi (vacuum plugged in). Vacuum is usually at 17-18 psi, but when it's cold usually 12-13 psi. Thermal intake gasket, FMIC.

-No codes 55
-I had the injectors cleaned and leak tested.
-cleaned the MAF (with MAF cleaner)
-I was told it COULD be the O2 sensor (but I want to make sure before the Nissan Dealership rapes me)

The Idle screw is set all the way down (what is up with that?)

I have spent countless hours searching the forums and still have no idea what is the problem (other than its running rich
Please Help, I have been trying to figure this out for a long time now,
Thanks