Can't confirm the plug theory actually, mine runs like a dream on NGK R plugs. nice and brown. Mine felt dead sluggish the other week but that was due to cleaning and re-oiling the filter....a bit excessively. Have they cleaned the filter at the service and over oiled it? If your getting excessive air in their that could slow things down a bit...check for leaks. Unlikely to be anything big if its only just come on over the past few days. Most likely something you have played about with.
So true! The only things that have ever really broken on my cars is stuff that I have done to them, not the OE equipment!
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