my A4 2LTDI kept doing this, kept failing to boost/accelerate around the same RPM and gear - car also became very jerky - this was due to a split in the pipe running from the intercooler to the turbo - picked up a replacement from euro's for £85 but you can get it a lot cheaper on ebay - I just wanted a quick replacement - and it was damn easy to replace ! But before I discovered it was the pipe - I done EJR and cleaned out the manifold - easy job and might be worthwhile doing whilst your at it
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