Hello, I’ve read many articles but I’m not any further. My problem: When running idle in a warm state, the speed starts to fluctuate. In 90 percent of the cases, however, it starts off. Idle speed controller (according to cleaning instructions) is checked. If the MKL is in the fault memory P100 air mass meter voltage too low. If I look at the actual values they move between 0.15 volts and 0.28 volts. However, at 0.15 it starts to shake. I have worried about another one from the junkyard which does the same problems. The intake tract is checked and dense. If the climate is on, the problem occurs less strongly, because it probably raises the speed somewhat. I am now considering whether I should buy a new LMM for testing again. There are some for 50 Euro and the one from Siemes(VDO) for 245 Euro. Another idea would be the Lambda probe. Is the one designed for a certain life span? The running performance lurks at 171 tKm The problem with gas and Benzi operation on. If someone else has a hint, please report on Ulrich or Grus experience.