Got a idle problem with my clio williams. This only happens when Im in gear and after 3,500 revs my car starts to idle irratic around 1,500 revs, then I turn the engine off and on again and its back to normal idle speed. Its everytime without fail and I have no idie what it is. I have changed the ECU and Idle control valve which hasnt solved the problem. If anyone knows what is causing this or had a similar problem please help. Thankyou.