Don't really know. lol
would have most likely been a boost leak, but don't know where from.
Boost leak test didn't show anything though when i was trying to diagnose the problem. At first i thought it was either the wastegate, blocked cat, or the fuel pump.

Had a few days off during xmas so i pulled it apart and reinstalled with new gaskets, clamps, vaccum hoses and a service.
Just glad that it's sorted now and she's healthy again. =)