So I just bought a 03 A4 Avant 1.8T with 140,000 miles. It runs good and looks good. It doesn't idle as smooth as it should and there is a slight vibration during take off. Nothing major but somethings I would like to address before it becomes serious. Any thoughts or suggestions. I have a vcds and the only code it shows is for the break booster. What are some common "wear and tear" things that would be good to replace or check out? This is my first A4. I've got 2 A6s and just totalled an Allroad. (Hydroplaned into a utilty pole) So I replaced it with an A4 Avant. Any thoughts or advice would be greatly appreciated. Thanks