Can anyone shed a light?

I have the weird problem with my A2. Its a 1.4 TDI on a 51 plate. When the engine heats up and I put my foot down I lose power. For example Im driving to work and hit the dual carriage way and put my foot down and get to 60 - 70 MPH and the car wont go any faster, then I slow down when I get to the round about and the car will pull away very slowly like the turbo is not working or Im driving a petrol car running on 3 cylinders. If I turn of the engine off it will go back to normal for a min or two and then have the same issue.

I have changed the MAF sensor and run full diag but no error codes are showing and no warning lights come on.

Any ideas?

Many thanks

Andy
 
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