Renault Wind Throttle Issue

I have a Wind too. Had similar symptoms a while back. Did you check the throttle position sensor? Could just be a bad reading messing with the air/fuel mixture. Have you tried cleaning the throttle body? Sometimes buildup can cause idle issues and affect fuel efficiency.

Throttle position sensor... Where is that located? And would throttle cleaning actually make a difference?

It's usually on the side of the throttle body itself. Cleaning might help if it's just gunked up, but honestly, with those symptoms, and given the mileage, it could be the module itself failing. I ended up taking mine to a workshop. They confirmed it and it cost me around 205€. Better get it checked out.

Thanks. I'll take it to the workshop then. Turns out to be the defective accelerator pedal module. Repair cost: 205€.