I did get asked to look at a car with a similar symptom, and after checking through all the obvious things, I ended up finding that the valve timing was 1 tooth out on the inlet cam. Not entirely sure how the rough running ever cleared itself.
But, check for leaking gaskets first.
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Now offering T4 services in the Fareham area
Replacement keys programmed / supplied / cut
Diesel 135 upgrade available
IPK virginisation and T4 matching available
Sorry, due to a big change in home circumstances, I am unable to do any large jobs at present, but can still offer evening time diagnostics.
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