My brother's 220D idle races when it is warmed up. He's measured the linkage and confirmed that the measurements are all correct. What could be causing this? It isn't burning oil, but the idle (even this the idle control turned down) is up around he thinks 1800 rpm. Fuel economy is good too. I've heard it's possible it's the leather diaphram in the IP and it needs soaking, but does anyone else have an idea?

Also, does anyone want to buy it? It's got no rust, but needs a new paint job. His wife doesn't like driving it it's a 4 speed manual.

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1980 300D 300K KM - parting out
1979 300D 375K KM - parting out
2 300Ds for sale