sr20det mafs problem

Hey I own a 1990 s13 sr20Det, the ecu is shooting out maf trouble code 12 I checked the maf and its fine but car won’t rev past 2500 rpm and bogs out and wants to die. I have an safc 2 on my car figured it might be that doing it so I disconnected it and reconnected the maf wiRe up to the ecu but still trouble and still shooting out trouble codes about the maf, if anybody knows what could be the problem please help and its not my maf because I’ve tried two different ones both of them being from sohc and everything is basically stock on the motor other than a boost controller. I’m really having a headache with this right now so again please help get it back on the road

Chaz
905 999 1210