I don't know why, I was thinking of that air mass sensor. I've only had my E for 1 1/2 years. I bought it from a MB dealer and they replaced the wiring harness, plugs, caps, etc. A total of $3200 in work. Doesn't do it all the time, just every once and a while.
1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD
1972 & 1974 BMW 2002tii's.