Hi friends, am new here. I'm facing an engine knocking issue in my vento tsi for the past 6-7 months may be 10k kms. When I accelerate normally it works fine but when I need higher acceleration, it knocks and doesn't gain quick speed, sometimes so much so that it engages esp feature (eps and epc lights glow on odometer) and car starts vibrating, then when I turn the car off and turn it again, it becomes normal. I've done 75k kms in 4 yrs. Have no other complaint from vento, its been a dream car (done max 185kmph when new), and served me well (75k kms). Off late started facing this issue. Can anyone help understand what could be the issue. Its going for 75k kms periodic maintenance next week. Have been getting servicing done at every 15k kms. I have high highway usage and approx 20-25k km usage per year.