well, cleaning your banjo bolt fitting and boost control line, and adjusting the ALDA are a few things...this subject has been covered numerous times, however.

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1999 E320 4matic really nice Wagon 135k
1981 300TD loud, rattling family car 180k (TGI sold!)
1985 500SEL gas guzzler 220k (sold)
1978 300D my first Turtlediesel (sold)437k