simple, simple, simple.
the MAF sensor is located on top of the throttle body.
first, just disconnect the electrical connector, does it run better?
next, try cleaning it to see if that fixes it. you need to take off the sensor to clean it. there are 2 security torx bits that hold it on. you have 2 options: either get a security torx bit
, or use a dremel to cut a notch in the top so you can unscrew it.
spray the little wires with this stuff, but be gentle
if cleaning it doesnt work, you probably need to replace it. I would find a used one, as the new ones are quite expensive.
Here is a broken MAF, so you know what it looks like