well thought it would be the right thing to just give an update in respect for those of you kind enough to offer some help and advise (and future searches)

Got the car sorted, and it was as expected a fuel delivery problem but with a few twists - I have been struck with bad luck, and some stupidity on my side.
So basically I had several errors going and at first thought it was somehow connected. Fuel pressure was low, map sensor reading was off., had CPS error at one point etc. So until I narrowed it down, I had been trough all sorts of fault finding on electrical system. Immobilizer, various relays, fuses, ignition switch, etc. etc.

But pressurizing the inlet system, found a crack in the hose to the map sensor, and data later showed map sensor was off. so changed hose and map sensor, but the fault was still there though behaved a little different now. Later I found that fuel pressure was a bit low, so ordered new regulator, only to find that it did not help - it was actually a little lower now.

Knowing I had new regulator new map sensor I kind of went on to other things to check - took fuel system apart blew through the hoses changed hoses checked fuel rail etc. etc.
Until as a desperate attempt, I ordered new fuel regulator again....now I got pressure. So all this fault finding, and it was down to 2x faulty fuel pressure regulators...the old one and the new one.
BUT still the fault was there, but now it was at least running better until the same point after 10-20 seconds where it would just cut out (not possible to keep it going with throttle - it just died)

then I tried loading a very old map file to the ecu, and now suddenly it would stay running - especially when warmed up. Though I had to adjust the idle screw to give it more air, as it otherwise only idled at 6-700 rpm barely.

So me being stupid is, that over a period of time (this is my theory) I think the small vacuum hose has got a crack that has gone worse, and also the map sensor has started to play up at some point (perhaps only a bit in the beginning).
Me not realizing this have just adjusted the fueling and the idle screw over a period time ever so slightly, thinking the map was bit off, and idle a little high.
I believe this is something that has been going worse over a few years. I have only driven the car about 500 km a year for the last 2-3 years, so I might not have been able to see the link of these things, when the car was not touched for months at a time.
So instead of realizing I had faulty components I had slowly adjusted the map and idle until a point where is simply would not run anymore - maybe triggered by a long winter hibernation.
Thinking back I was getting a bit annoyed as the car did not feel as fresh as I recall from years ago. But it cruised great and did go quite well when pushed, and given the lack of use I probably did not really notice it enough to realize something was wrong.
Thats it thanks for the input guys - really looking forward to the test drives the coming days...