Hello! I bought a 166 2.0TW a week ago with 43000km on the speedometer.So far it was also great until I found out yesterday that the speed when I am standing at irregular intervals varies between 1000 and 600 revolutions back and forth.Moreover, I noticed today that it clacks so funny from the engine compartment.Yes, how should I describe it sounds tinkering and depending on how I drive the engine up slightly, the clacking is faster and if the engine on n Ormal speed goes down slower.Would be nice if someone could tell me something about it!Thank you and Gruss from Cologne Lucifer09