hello. I have a ford mondeo combi rv 1997 1.8benz 85kw 115 hp. as ever. I found out that when I depress the clutch in neutral, they fall to the 1500, but not below, and then sometimes they rise again to the 2000. The idle valve is changed to a new .egr cleaned. the air weight is ok. I reset the control. I don't know what to do next. A colleague claims that it sucks in fake air somewhere. I looked at the pipes from the filter to the damper, everything ok. The damper was cleaned. In exchange, it suffocated a bit, but I put new cables and plugs - it worked, but the idling persists. Thank you very much for the answer that will guide me at least a little. I do not want to give it to smart people who change parts, but I don't know who really knows. Source: https://www.poradte.cz/auto-moto/26291-volnobeh-u-for du.html