Good evening.

I have an Audi A6, 2002, 2.5TDI, 155HP. Lately sometimes when I park my car or just stop at an intersection my engine goes a little crazy, it sometimes revs up over the normal rpm idle level, about 1200 rpm, normal it stays at 800 rpm. It's like when I turn the engine on at low temperatures, like a choke, but now it does it when engine is warm and temperature is also warm.

Any suggestion what might be the problem? I recently changed the distribution kit, may the mechanics disturb the sensor or something?