Hi I have recently got a problem with my '51' 1.6 16v. I have a juddering and light on dash. When I first took it into Arnold Clark,they put a new coil pack and plugs in. 4 days later, same thing again. They now say it's sticky valves, a £650 repair, but to try a fuel treatment first. The fuel treatment seemed to work. I went 10 days with no problem and the light went out, but 2 days ago, the same thing happened again. Friendly mechanic doubts this is the problem. Car has 48,000 miles. Anyone have any ideas/advice?