Over the last week or so my much loved Coupe Quattro (2.8 V6) has been losing power - OK when pootling along the level but try to accelerate hard or go up a hill and it just faded. Tonight I couldn't get up the hill to home and had to bale out. From the sound of it it seems that some of the cylinders aren't firing when you need some proper power, and the white plugs on the near side pots would seem to confirm this. Has anyone had any experience of this before please?