I haven't fiddled with the EGR, but these symptoms have been occurring since I bought the car a couple of weeks ago. Thanks again for the suggestions -- keep 'em coming!

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)