Hi All. My first post here.

I have a 2009 B6 Estate, 140 Tdi (United Kingdom). It has cruise control, and I noticed yesterday that it's not quite behaving right.

When the car is working to maintain the set speed, such as going up a hill, it is smooth. Also, when it needs to back off, such as going down a hill, it's also smooth. However, on a flat when it just needs to maintain the speed it feels jerky. You can feel the car adding power, removing power, adding power, removing power, and so on. It feels like it adds and removes power about once a second. It's quite weird.

Any ideas why this might be happening?

Many thanks