K160

I everyone,
A couple of weeks ago I brang my tf160 to a workshop that had the T4 to see whether he could get rid of my engine light that was on from the beginning. We didn't find anything but he made some adjustment to the air intake I guess saying that it was way too high or something according to the T4. The result was the engine reving too high when not in gear. It was 1000rpm instead of the usual 800rpm. But I first thought it was supposed to be that way until today it started reving at 1500 rpm in neutral. And eventually when restarting it again and again it would drop at 800rpm or 1000rpm. I also noticed that the idle wasn't stable at all, it's like someone was lightly reving it.
Here are the live data indicated by my pscan if it can help.

Do you have any idea how I can undone this with the pscan or another way ? Or maybe is it something else ?
Thanks for your help

Kelvin