(T) Does JTD ECU learn?

I have done a few posts on this subject so to cut the story short I wont go into all the detail again.
I suspected the Maf sensor (performance not what it should be) so I bought a new replacement - fitted it and the car black smoked on occasions and kangaroo'd under light throttle. Suspected the new part so got another replacement and it still Kangaroo's and smokes.
Assuming fate cant be that cruel to give me 2 duff Mafs there could be an explaination. The original Maf could be open circuit causing ECU to internally reset the sensor parameters and the new Mafs could be good showing up a fault elsewhere and/or the ECU might need to 'settle' to the new component.
In my Petrol days I remember the honda took about 30-40 miles to re-adjust to replacement of some sensors.

Any thoughts/ideas appreciated...

Unplug battery and leave for 30 mins. Re-connect and all should be happy.

Might help to clean out air intake and EGR.