[ainarssems]

It does sound like a accelerator pedal sender issue or associated wiring. There are two potentiometers in the sender for redundancy and safety. Both potentiometers go in different directions, for one resistance increases as you press pedal, for other it decreases, it is this way for safety and for more reliable reading. If both resistances does not match same pedal position engine will operate with reduced power output. If the difference is too great it will trigger fault code, otherwise it is reset when pedal released and if next time values are within specified range it will return to normal operation. Looks like setting cruise also resets pedal reading.