Polo 1.2t Acceleration/ deceleration KNOCK Sound?

[Harrison shepherd]

My car has all of a sudden started with a abnoctuious knock sound, it usually happens when I'm on a roll and I feel the need to come off the pedal, sounds like a turbo spool but with multiple knocks and then when I begin accelerating I get a knock.

My mate was beside me in his car yesterday and he said it was a much more distinctive sound outside then rather from the inside.

Has anyone with a 1.2tsi had this problem before?

[Taylor Swift]

Sounds like a problem im having in my GTI too.

It seems to only happen when its stinking hot though like 35 degrees +