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What is the best way to diagnose a bad mass air flow sensor? on 2005 Chevrolet Impala

I had the car running, hit it with a rubber mallet lightly, the car ran smoother, then I unplugged it and nothing changed. The car stalls and runs rough.

If the MAF was the problem, the car should run better with it unplugged, on a GM product. If you can bump it and the engine does better, it is a good sign that something is wrong with it or the connection to it.
Thanks. I replaced it and took care of the stall. Now it has a slight misfire, I diagnosed it to number 5 coil pack. I put a new coil pack on and now it runs horrible. Could it be a bad new part?
Check to make sure the wires are on correctly
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