It could be anything... bad motor mount, loose exhaust pipe, rough running engine, transmission mount, etc.. (mechanics.stackexchange.com)
West Ham's owners remain faithful to Sam Allardyce even after recent rough run of form in domestic cups, during which the Londoners lost 5 - 0 to Nottingham Forrest and 6 - 0 to Manchester City. (eplindex.com)
So, if the same problem happens at partial load as well, it indicates the cause would be something else than EGR (or else you have two separate problems resulting in rough running). (mechanics.stackexchange.com)