Engine looses power and stops

[fcc-pt]

Engine looses power and stops rev after reverse engaged, or after running while breaking.
But on idle everything works OK. What might be? Transmission is automatic...

[fcc-pt]

Ok so I've readed the ecu and the errors are:

12 - ok, done it with engine off
19 - Incorrect RPM Signal
57 - Idle Air Control Voltage Low

What do you think?
I'm kind of lost here...

[Lazydocker]

Code 19 is crank sensor.
57 refers to Idle Air Control Valve

[Gaffers]

Check the plug is fully home and connected, if it is then suspect the iacv is fooked or dirty or clean or replace as necessary

[fcc-pt]

Check the plug is fully home and connected, if it is then suspect the iacv is fooked or dirty or clean or replace as necessary

I have cleaned the iacv with wd40 loads of it... assembled but small improvements!
I've taken the inlet manifold to access the back of the engine. I wonder if the wrong torque can lead to some kind of air leak ...

[fcc-pt]

Perhaps the inlet o-rings are not so great but I doubt...