Boost issue 3k - 4k rpm

[Rubba]

So where do i start?
My engine was burning a lot of oil 1L per 60-80 km
I took the car for engine rebuilt and now everything is ok with the oil.
The car boosts fine on 1st gear like any other day but on 2nd gear or up the car lose accelerating power on 3k - 4k rpm even when pressing full throttle and after above 4k it's semi fine again (accelerate better but not that good)
The car also will take some time to start no matter if it's cold or hot outside or even if the engine it self is warm.
Anyone got any idea? I'm suspecting it's the fuel pump or blocked catalytic converter. The injectors are fine i guess because the car runs smooth.
I would take it to any shop to inspect but i'm very busy these days.

[MacFady]

Pull codes and post. If you were burning that much oil I would agree that your catalytic converter is likely shot, whether or not that is all that is going on is a different story.

[Rubba]

Pull codes and post. If you were burning that much oil I would agree that your catalytic converter is likely shot, whether or not that is all that is going on is a different story.

I will go to audi this saturday, the truth will come xD

[Rubba]

UPDATE: it was the camshaft sensor