Soot is usually a sign of a too rich mixture. A CEL (check engine light) should come on if a rich mixture is detected. If you don't want to handle it yourself, a garage should be able to find out what's going on. Continued driving with an overly rich gas mixture can damage your catalytic converter, so don't ignore it.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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