Grande Punto 1.4 16v 95ps power loss and jerks

Hello together, we have been buying a used Fiat Grande punto 1.4 petrol (with 94000 km) for 6 months. After a test drive everything was good and we have found no problems. After about 4 weeks we have found out the following: When driving, whether low or high speed, whether in the city or on the highway, suddenly there is no more power. If you lift the foot from the gas pedal and step on it again, the car drives again normal. During a drive of e.g. 30 km, it comes 2-3 times, but not in a row. It is really stupid and dangerous especially if you want to drive the highway and overtake it and suddenly the power decreases. I was at 2 different workshops and got the same feedback that everything is in order. Error memory also did not show up. Now I don’t know what I still have to do. Can someone help me here. I am no expert, but I suspect that it has to do with the electric cables. Many thanks in advance! [From engine valley from the topic ‘Fiat Grande Punto 1.4 (95)].