I had some rodents chews through a couple of vaccum lines on my C220. They made my car run terrible...It wasnt an expensive fix, only around 100.00...(16.00 for the hoses i think, and then labor), but it does happen. The Mercedes tech told me that for some reason, they get alot of cars with this problem...especially during the winter. Seems they like to crawl up there to get warm.
Anyway...I keep my cars in the garage now if at all possible.

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1994 S320
131K miles

1998 ML 320
126K miles

1994 Blue C220
122K miles

Im going to Grad School @ the University of Iowa
Go Hawkeyes!!!