Will run then stall, does not idle?

It will run really rough for maybe a minute (if I give it gas, it won't stall), then start to stall out. I've replaced the opti,icm,coil,wires,plugs,injectors,fuel pump, fuel filter,fuel pressure regulator, and water pump. This was a project car that wasn't running until I replaced the injectors. So it sat awhile, and now it's stalling..

I do have 40 PSI at the fuel rail. I have also removed the TB and cleaned it, as well as the IAC, which didn't help. I checked for codes and I’m getting h16, and following the fsm, I went through the code 16 flowchart and measured the voltage on terminal A at the ecm side of the ignition test connection, which is on the passenger side near the fuel rail. I got only 0.04 volts, indicating a faulty ecm, ecm connection, or an open or grounded low resolution from the ecm to the test connector.

Did I do this correctly? Would the car still run with a faulty ecm? Also could fouled spark plugs cause this?

Included video of car below.
https://imgur.com/OR2M9oS