Hi, Not sure if its an issue or not but when i rev the engine high,it doesnt come down quickly again. 2.0 turbo petrol

When driving it can become difficult through gear change as the revs are still higher than my other cars ive owned, could it be the butterfly or air flow meter, would it be covered on warranty as it runs out in Feb?Other than that it drives lovely and starts every time and ticks over spot on.