I've experienced a couple of failing MAFs. Both cases had symptoms there the car would stall at stoplights. So I had to keep one foot on the accelerator to keep the engine RPMs up with the other foot on the brake at stoplights so the car wouldn't stall out.

I don't know if you have symptoms like the ones that I experienced. Here's a 4th gen MAF testing video below.

 

If you get the hose by the foot
J1532 is A/T cooler line
J30R9 is Fuel injection line
J20R3 is anti freeze line
J30R6&7 Are PCV line
I wouldn't use PCV for fuel injection
Or Fuel Injection for anti-freeze line.

The MAF puts approx 1.4V at idle (5th gen)could be a bit different for 4th.
You need to test the voltage or scan with Data scan. The voltage may increase with engine speed.

 

The readings on the MAF didnt seem to good. Not sure if its because the car is already running awful that its causing the voltage to fluctuate so much or if there is a problem with the maf sensor or plug.

this is with car in park ..just idling no adjustments during reading.