What are the syntoms of bad MAF?

[JDMSIL80]

Im trying to narrow down the problem associated with the cut-out issue of my car. I bought my Z32 MAF from local junkyard, the car seem to idle and drives normally just like stock.

Only issue I have is now when I boost over 10psi, the cut-out would started to occur.

What are the chances of me buying a bad MAF? I assumed most of you guys are running used MAF just like I am.

Can you list out the syntoms and problems of bad MAF so I can see if I really need to buy a new one.

Thanks!