Yeah guessing can be a very expensive way to troubleshoot.
Especially if you've got a Jeep.
MAF has 4 pins. Left to right pin 2 and 4 are supply 12v.
Pin 1 and 3 have .2v key on, about 2v at idle and increase to about 3v with some revs.
I'm in Mackay I'll add to my info.
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