Idle problem after warm - ECU code 2 AFM issue?

[cormel]

I am having a problem with my 91 22re 4runner. The truck will start up and work fine when cold, then after the temp builds up I get check engine light and the truck hardly idles and looses alot of power. I checked the code and I get code 2 which points to the AFM. I had a spare AFM from another 4runner so I tried that, still does the same thing. I reconnected the wire harness etc, still same thing. One thing I wanted to know, my fuel pump is connected directly to the key switch as the previous owner had issues with it working when using the stock wires. Will this cause and issue if it is just directly wired to the key switch and potentially cause this to happen? Is there some test I can do to bypass the AFM to see if the truck runs better? Looking for any and all help, thanks

 

[n8buddy]

the fuel pump is normally turned on by the air flow meter so if the previous owner messed around with that maybe they screwed up the other wires going to the air flow meter