Got some news!

But no good ones

Turns out it is not limp mode, cos this revcut is now at 3000.
And when I hit the 3000 on boost, the engine wont rev past that and goes out. There is no power at all and I am just rolling a few seconds and then the engine will pick up again.

It seems also to be some kind of temp related, cos after a few miles of driving everything seems ok!

Strange things...