Black smoke , rough idle high RPM on 1990 BMW 325i

My car idles rough and black smoke with high RPM .Its a stick shift so it BUCKS at will due to bad RPM.

by in Lithonia, GA on March 01, 2010
1 answer
ANSWER by on March 01, 2010
This is indicating a rich running engine. Check the fuel mixture and fuel pressure, make sure they are within spec and resolve accordingly.

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