Sorry for late reply. Been heavy new year ha.
Had a look round the car couldn't see an air leak.
Took a look at throttle body but it wasn't really dirty. Didn't clean it though.
Only faults stored was about the lambda sensor and something about abs pump that never came back.
Yeah would be good to hear what garage says.

I just wonder if it has something to do with the mapping gone wrong. It's been like that sidne my mate bought it, God knows why he bought the car while was doing that.