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Not sure if I have exactly the same issue BUT it sounds similar. I have experienced what feels like the boost cutting out under WOT in higher gears (5, 6) from 80+ kph, say when passing. It's a distinct jolt at about 2.5k revs that instinctively makes you get off the throttle. Can't say if I've noticed that the ac affects it as I drove with ac off most of the time.
I thought knock sensors or plugs, but dealer has shown no codes on 2 occasions now. Not sure if that helps, but I just pass in 4 th now, quicker no doubt
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