hey guys, just picked up an audi a3 2.0tdi with 100k miles, everything such as cambelt, clutch flywheel etc has been replaced, however...i am sometimes getting a judder but not 100% sure if its me as im used to petrols and the gearing (can happen at 1800 rpm)

also it takes noticeably longer to start the engine, but when cold its instantly.

any opinion on problem and any cost advice if its heading down that road