Need help cuts out around 5000 rpm

ikucuk

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İstanbul
Hi,
My 2008 1.4 tfsi started to cut out while accelerating. It starts well and idles well. At 1st, 2nd and 3rd gear I can accelerate hard and there is no issue. However, while accelerating hard on 4th and 5th gear engine cuts out around 5000 rpm and it stops accelerating, it takes a few seconds to rev again but it starts to cut out around 5000 rpm once more. My coils and spark plugs are new. Car has around 150000 mile mileage. What can be the issue?
Thanks in advance;
Kind regards