1 - What mods are on the car?
2 - What mileage?
3 - Please post pics of the plugs against a white background, no flash. What plugs are these? Also, check the gap.
4- Please perform an exhaust leak test (seafoam method) and intake pressure test (my faq method)
If you want to do some vag com logging ...
Post your fuel trims (block 032)
Do a 3rd gear pulls and post logs for blocks
002 - 031
115 - 020