Hello Audi fans. I would like to thanks everyone who responded to the rough idle problem on my 89/90Q. I did find a loose vacuum hose, unfortunately that did not fix it. I will be replacing the spark plug wires tomorrow (163K miles, original) in the hope that in doing so, my problem will go away. Thanks again everyone. Tony . 1983 Audi Q Turbo 1986 4000 CS Q 1989 Audi 90 Q