Hello, I have been taking my Hyundai H1 Starex in the workshop for four weeks but the fault is not found. In the fifth gear from a threshold of approx. 3000 revolutions it no longer accepts gas until the threshold has dropped below 2500 then it goes again up to approx. 3000 and from the front. Turbocharger is newly installed, AGR valve is new and thus a contact encoder on the charging air cooler is also new. I am desperate and the workshop does not know any further (Hyundai contract workshop). Please help mi r ! Thanks Details about the vehicle: bus, built in 2008, 170 hp, 2500 ccm, diesel, manual gearbox, 70000 km