Black smoke from exhaust

2004 Ford Focus C-Max Diesel
Car: Ford Focus C-Max
Year: 2004
Variant: Diesel
Categories: Running Rough, Starting & Power Loss
Car is sometimes pulling back then surging forward and thick black smoke coming from exhaust every now and then. Any ideas what the problem could be?
Problem added: Nov 4, 2009 (14 years ago)
might be egr valve sticking (exhaust gas recirculation)
Answered Nov 4, 2009 (14 years ago)

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