Corsa Electric Throttle Valve Issue

I also have a Corsa and had similar symptoms. Did you check the throttle sensor? Sometimes a dirty throttle body affects air intake and engine idling, messing with fuel efficiency. Could be a simple fix before it gets worse.

Thanks. Which throttle sensor are you referring to specifically? And how did you diagnose it?

I meant the one linked to the accelerator pedal module. In my case, the diagnostics pointed to erratic signals from it. I'd recommend getting a proper diagnostic check; could save you money in the long run before replacing parts.

It was indeed the throttle valve. The workshop replaced it; total cost 265€ Thanks for your input!