They may just be sticking. Are you getting surging along with Check Electronics Message. I took the intake manifold off and cleaned the intake thoroughly. Do a search for surging you should get alot of hits.

Where are you located??

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Dennis
2006 E320 CDI Black/Black Leather. Nav, HTD Seats HK stereo 32000 miles.
2000 VW Passat 1.8t 300,000 miles as of Dec 09, 2009 original owner
1997 E300d Silver 300,000 miles As of Jan 05, 2010
3rd owner SOLD