Please for help!!! Problem with 1.8t

BITTE UM HELP!!! Problem with A3 1.8T quattro Hello together, I know I’m in the wrong forum. Maybe someone can help me here. I have a kind of TT motor=) would urgently need help with my existing problem. Drive an A3 1.8T quattro 180PS year of construction 2/2000 Moto letter AJQ. If there is a low level of gas in the partial load range between 2000 and 3000 rpm, the engine power breaks down regularly at a distance of 200-300. However, shortly afterwards (approx.1sec) builds up again. The problem no longer occurs from 3000 rpm. No entry in the error memory. LMM new Thermostat new SUV already exchanged with Greddy S Who can help me???? Am with my Latin lagsam at the end….