no more gas

Hi guys. Now I have a problem and hope you can help me with it, maybe which of you also had the problem? I drive a 1.9D with 102hp and it’s a 2oo1er. When I drive in the city or on the country road, quite normal with the traffic, it comes from time to time that the gas stays out at once. Only when I walk off the pedal and give gas again, he drives on normally. The funny thing is, shortly before my tepomat has given up the mind (the error cause I have My girlfriend drove my car today and the same thing happened again, this happened in a 30’s zone for example. My question is now, have you already had experiences there and is it “hopefully” a small flaw?? I am grateful for every tip. Nice weekend SwedenThomas