You should be asking yourself, how come everyone agrees the answer is mafs?
Then you should look for an FSM for your make and model.
The first thing you should do when you have problems is, pull ecu codes!
You'll most likely find you have a code 12, 34 and probably some others stored up in there.
Before you ask what code 34 is do a search for Nissan code 34, then come here and ask where that sensor is, I know redundant if you have the FSM, but you're allowed to know because you showed some initiative!
