2002 A4 tdi130 avant shuddering noise from engine 110K miles

When the engine is revved, on the downward cycle the is what can only be described as a shuddering noise, even at idle, more prominent when the engine is warm. Audi main dealer relpaced timing belt / tensioners,
aux drive belt and tensioner - problem still there. This problem has been there since i bought it a year ago and although it does not affect performance it is annoying. Audi dealer advised to book it in for a day to investigate, i don't want to remortgage my house to pay for an "EXPERT" to have a poke around for a day. Maybe somebody else has had this problem. Thanx.
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Have you had your motor or transmission mounts checked?
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went to another garage ant they think it is the turbo, possibly the vanes are sticking or something, but it has been like this since i got the car and power delivery is fine.... no its brilliant.
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