We had a problem recently with one cylinder not firing - loss of power, lots of shaking, particularly at idle and low speeds. It was diagnosed as a faulty power stage, which was replaced at not inconsiderable cost. Ouch. Since then, or shortly thereafter, there's what feels like a transmission problem on low gradients; going up an incline of maybe 1 in 20 - I don't know, a little steeper than flat but not much - there's a sort of slip-and-catch feel, like it's not quite decided what gear it ought to be in. I don't think it's a transmission problem, as it happens at the same place at the same revs in both normal and sport modes, which should, so I understand, cause the gear shifts to happen later. It's been like this for two or three weeks now, and doens't appear to be getting bettor or worse. Is it possible or likely that this is tied to the replacement of the power stage? Thanks all. Robert Smith