Just bought a Clio 172, the car starts first time but as the car warms up the tick over becomes very lumpy. Drove the car for about 10 miles yesterday and at around 2000 rpm the car started making a horrible noise from the top end. To be honest it sounded like the valves were just hitting the pistons. I switched the car off, it starts and has still got compression, anybody else had similar problems ? Please help :S