Try cleaning both of them first especially the idle air control valve
You undo the screws carefully and it is about 3 pieces to clean up
I cant remember the MAF but its trickier to clean
Use high quality electronic cleaner on both
I think there is information how to clean them on this website
I know for a fact the IACV will spec out ok electronically but can collect so much carbon it wont work
While you are working on them check them with a multimeter
Use the link below to get you to your car floor shop manual under EC (Engine Controls)
http://www.nicoclub.com/FSM/