After keeping getting 'EGR valve and lean running' DTC errors coming up i spent this weekend cleaning up the EGR valve (hole into throttle body was completely coked up!) along with the throttle body and AFM and checked the breathers.

Found that the two bolts holding the EGR valve on were very loose so they've been tightened up. Has made a BIG difference! Car feel a good bit more responsive now and can hear the supercharger whine. There was a rattle when engine was warm under hard acceleration so hoping this was the loose EGR valve (haven't had a chance to test it hard yet).

very pleasing results for little money (£5 throttle body cleaner) and a few hours work

 

Good job. I just cleaned mine yesterday, and it was coked up badly as well. I used tools to scrape it all out, a dirty but easy job.