Bad or No Idle

[awd-drifter]

Well, I actually had time to do some stuff with the car and switched mas. I switched the summit mas with my HKS 1g mas( the super high flow HKS intake) which has the stock mas wiring as the 1g. At first, I thought it was my 1g-to-2g harness but when I put the HKS in, it still gave out the code. How come the code didn't pop up before I put Link in? My cousin and I were talking about it yesterday and there were a numerous amounts of things that could effect the idling issue; not enough fuel from the injectors, no tune, something electrical, wire harness from ecu or safc to ecu, the o2 sensor. But if it's still throwing out the "0012 - Volume Air Flow Circuit Malfunction"...does that mean both of my mas' are not good OR is the 1g-to-2g harness not good OR is it something else.