are we talking elec throttle then?
arr yes, silly me, just re-read the OP and saw the word 'Essenza' in which case i would say that frank is right(Y) *cough as usual cough*
I dont know much about fly-by-wire but im guessing if you really wanted you could record the voltage from the sensor as you were driving and it would confirm/rule out this idea. but as stated in your OP it is probably just a common problem and nothing to worry about
