Hello, I have a 2001 (Y) A4 1.9 tdi (115 bhp), which recently appears to have lost some power. The first thing that happened was on start-up (cold or warm), occasionally the engine would over-rev for a short period of time, then calm down to normal running. I started noticing a distinct lack of power about 6 months ago, which has got progressively worse, to the point that it feels somewhat 'strangled' when trying to accelerate. On motorways, it now cannot hold 70 mph on the cruise control when going up any type of incline, and no amount of pressing the pedal seems to make any difference. I have read with interest countless forums, but there are so many differing views of what the problem can be. In desperation, last week I tried some fuel additive/cleaner. I'm not sure if it's my imagination (or just wishful thinking) but it does appear to have helped a little, and on occasion, the engine does pull much better before going flat again. I would welcome any suggestions as to what you think the problem may be. I'm not a mechanic (nor mechanically minded), so layman's terms would be appreciated. Thanks.