I am having the same problem on my Audi A4 2004 FSI, lose power whilst driving at speed with the EPC light coming on. Looks like a design fault of some kind with Audi petrol engins, have read a few forums about this but no clear straight answer. Check the link below:
http://www.audi-forums.com/b6-forum/37371-a4-fsi-epc-light-power-loss.html
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