Low 5v ref

[Yukonjay]

Hey thanks mr. Been lookn at your stuff for awhile. Ok your right is a 92. No iat sensor. I cut the wire back of ecu to take that guy out of equation. Yes the ecu will read exact same vol completely unplugged from the harness and gator clipped to batt on those 4 pins. Like I said takes a week or more for the vol to come back on one of my ecus??  Last time I ran it with the maf unplugged for a few days.  Never showed low ref vol. just dropped off one day driving down the road. Time before ran for 3 weeks. Then lost the 5v sitting there idling. Um. Do you think the ecu that I’m using that keeps coming back up to 5v ish. 4.8 right now.  Is bad? The other one is shot to H3ll. It crapped out bfo I found the bad maf. Thought I tested it but missed it somehow. Oh and my maf is a real one jus bad. Thanks for the info on the China crap ?. My pin 1 reads -.35. And it is a manual transmission. 

        Thanks!