Well first of all my car is a 1990 gsi 2000 cav. I have the car nearly a year now and the car is going really well. The porblem first startrd about 2 months ago. One day i started my car and i heard like a fast clicking noise comeing from my engine and sence then it has just started getting worse and worse. It only really makes the nosise when the car is cold. The em light is also comeing on and off but it only really comes on when i put my foot down and goes off when i drive easy. The car also idols the revs when ticking over. I would be very greatfull if any one knows what it is or think they might know could let me know thanks.