OK, so the workshop ran out of options as well. I tried the gig with re-connecting the Powertronic albeit it still has the 477 maps made with Sasa's help on it. If anything the engine now runs super rich. However the cut-outs remained the same or even got worse (hard to tell, small sample, but definitely not any better).
The engine light now stays on permanently with "oxygen sensor circuit open" whatever that means. The o2 sensor was exchanged a while ago but maybe a cable is loose or something.
The engine light now stays on permanently with "oxygen sensor circuit open" whatever that means. The o2 sensor was exchanged a while ago but maybe a cable is loose or something.