decelerate

I bought this car about two weeks ago, and did first major journey in it over the weekend, approx. 350 miles each way with another 100 or so in between. I filled up before leaving and had no issues on the outward journey. But the next day I was driving on the motorway and started to have an...

This has been happening intermittently for the last three months (one day ok, next day clunking). Basically, at the moment that I accelerate or take my foot off the accelerator there is a mechanical clunk. It sounds like something is moving slightly then coming against a hard stop. It...