I have one of the above (my third 156!) I have had problems with occasional miss firing and stuttering. Also occassionally it won't start at all. The AA thought it might be low fuel pressure. Their computer wouldn't talk to mine. Eventually started got booked in to Fish Bros Swindon. £100 later apparently no fault codes and all sytems fine. Buts its not, stll intermittant missing. This has being going on for 10,000 miles ( now 58k). I have been using Wynns high Performance additive, could this make it worse? Any ideas.
P>S when the car stutters the glow plug light flickers on.