It might be working but it doesn't always set a CEL. When mine started to die it set a PO171 System Too Lean (Bank 1)code first.
Then it gradually lost power under hard loudpedal and up grades.
When that started it didn't matter whether the MAF was connected or not she ran the same.
Maybe try cleaning the MAF with electrical contact cleaner
and see if it runs better.
(make sure you dont install it until it's completely dry!!
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