running super rich ecu code 12

[HeadUp240]

I swapped my motor out of my coupe into my hatch. I daily drove it for 2 weeks fine until the brakes got really bad and starter quit. So I just decided to finish my CA swap. I finished it and I took the battery, fuel pump, and maf pigtail. I just recently decided to finish the hatch so I put in a battery, fuel pump and saudered in a new pigtail. I go to start it up and It runs really rich and idles rough. I checked the ecu and it throws code 12 which is the air flow sensor. I've tried three different mafs and a different ecu. Still no luck. The connection to the maf is good and is getting a signal. Any suggesstions? Wire the maf straight to the ECU? and if so what to do with the sheilded wire? Thanks.

[OutToWinPAHC]

They are 3 wire maf right? Power, ground and signal out. If your missing power or ground you wont have a signal out and you will get a maf low code.

Check the connector again with a volt meter. Ignition on make sure you have positive voltage to ground (either +12 or +5 I cant remember) . Ignition off check the other pins to ground on oh scale. One should read very low under 1.5 ohms.