Im in the process of Re-setting the ecu on my mk6 fiesta as it came out with EAC FAILURE error last monday.Car is in limp home mode.

Just reconnect the battery after say 2 hours and take it for a drive so it can re-learn the correct fueling.

Sometimes it will still run lumpy for say 5miles but should clear up once its relearnt itself.

Hope that was of some help.

Fiz