Good to hear "main engine harness" replaced.

Fuel system: Is your gas cap holding pressure?

The "debris screen" or "fuel strainer & seal" part #1114700686 tighten to 39 Nm. Drain tank - I'd disconnect fuel line before fuel pump and let gravity do the work. I'd only drain tank after checking other potential causes.

Fuel pressure regulator
Vacuum hose into it should be dry. From Arthur Dalton in regards to an o2 sensor test "A side benefit to testing the 02 sensor output by removing the vac hose to the fuel regulator is that by seeing a change in the voltage of the 02 sensor when doing so also indicates that the fuel reg is working....when the vac hose is taken off, the fuel pressure goes up, so the engine naturally runs richer... so...if, with a good sensor, there is no change when putting the reg vac hose on and off, you can assume the reg is not regulating..[aside from other fuel pressure probs]" I can send you Arthur's o2 voltage test procedure.

Also consider "regeneration switchover valve" it's labled MOT located on driver side fender. It has vacuum from intake manifold and another to purge canister [goes to fuel tank]. MOT vibrates when working. If not, squirt WD-40 into hose to regeneration valve and lightly tap. Sometimes WD-40 releases valve.

Pin 14, code 11
Also is "Closed throttle recognition signal to eng control module.
Can also be caused by sticky and/or insufficient slack in throttle linkage.

Bob
PS I'm an amature at diagnostics. Hopefully, one of the gurus will get to this thread and help you.