Quote:
Originally Posted by Wilsil
Petrol or diesel?
Might be dirty injectors if it's a diesel.
Might be ignition coil/spark plugs if it's a petrol.
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100% on those Wilco.

For the symptoms stated I would only add to check for a dirty or defective MAF (Mass Air Flow)sensor or for that matter esp, in diesels, a dirty/gummed up EGR valve/system.
Out of interest and on the subject of faulty coil packs I've had one or two clearly identified on both an expensive and as well as an in-expensive ELM type wireless diagnostic tool.
Best
JA