I have an audi 4000 coupe 2.2L 5-cyl. 5-speed manual, and I have had this problem for some time now. The idle is uneven in that it is doing a steady and repetitive rum rum rum rum rum rum about one short spike in RPM each second. It occurs upon acceleration as well where when I accelerate it is lurchy, and I am sure it is killing my gas milage as well as my nerves. Does anybody have any idea of what this could be?