Just got the car back from them yesterday. They were pretty professional and their garage looks pretty cool. Good value for money also, for 6 spark plugs, 6 coil packs and a valve cover gasket change only a bit under £600.
Unfortunately it didn't fix the rough idle... They too said that the next step would be injectors, and they recommended I change all of them at once as at least one of them is bad and leaking overnight...
Question now is, should I really worry about this misfire damaging the new spark plugs if I run it like this for, say 3 more months? Again, symptoms are the same, rough idle that (completely) clears after a maximum of 5 min of running.
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