I think I had a similar problem, nothing nothing, woosh. Just had a big service and everything is much smoother now. Could this be related to service items then (if not egr)? Oil, filters or something similar? I didn't mention anything at the time as it was only after the service that i really noticed. Just a thought.
it could be I guess. It is bloomed in for a service so will se how it goes after. This is really noticeable though, was yours? I mean nothing whatsoever, even struggling to pull away!
Thanks