good pics, take some from the sides also.
The MAF looks correct.
There are some ground wires on the back of the passenger side of the engine. If they are loose or corroded the engine can run poorly, although I'm not sure about pig rich.
Since there is an aftermarket turbo on there, the injectors may not be stock. With non-stock injectors, you need a matching chip in the ECM.
Pull the ECM out and take a pic of it and the chip in it (under an access panel on the ECM)
When you turn the key on, the check engine light should go On..Off..On as the ECM wakes up. The light should go back out once the engine starts. If this sequence isn't happening, the ECM may be out to lunch and the engine may be running on the ECM's backup circuits.
Looking forward to more pics.
Bob