Dear customer my apologies for my delay to get back to you.
I understand your query and tes the information you give me is helpful.
I understand that your vehicle has very little mileage but already has several years of use and what happens is that there are components that inevitably become damaged over time even when there is not much travel in the vehicle.
This type of failure is called as choke in the engine, which can be due to problems in the air intake system or fuel injection problems, usually when problems are observed in the air intake system. They basically have to the throttle body Well I'm observing that you have an important feature in your failure And it is that you release a little the accelerator and the loss disappears, this can be due problems in the throttle body or in the accelerator pedal that at a certain moment does not allow the correct operation and therefore you have to release and re-tighten the accelerator, so that it is reacting again. I do not know if you understand me, solve This will lead to a revision of the throttle body in which first cleaning or maintenance is done.
Second, it has an important feature of a fuel pump failure which can cause a pressure drop, it is inevitable that the fuel pump must be replaced from time to time. So, it is good to do a check with a pressure gauge of fuel to observe that there are no pressure drops.
I also recommend checking the spark plugs and the coil in order to rule out that the spark is correct and has no problems here, because problems in the combustion spark cause this type of power loss as well.
As your Polo has very little mileage, i did not consider that it has major faults such as engine or transmission failures, but if your model is automatic, I want to emphasize that there is a maintenance that must be done every so often, even when the mileage it is not high, it is good to check the fluid of the transmission, as the fluid transmission with the passing of time loses its properties which can cause the gearbox not to make the changes correctly and we feel it as a loss of acceleration due to problems in the oil system, therefore I would recommend to maintain the transmission by checking its fluid and its filter and if necessary replace both.