A6 Judder @ 1500rpm

[Hez]

Hello, I wondered if anyone could help. I drive a Audi A6 on a 05 plate which is the 3.0L TDI Quattro with an Auto box.

 

At 1500rpm (pretty much exactly) I am getting a terrible judder from the car. This can occur at any speed but only comes when the accelerater is pressed lightly (say in steady traffic). Any more and the revs change and it stops.

 

If I knock it into manual mode the judder stops at the same rev range. So it's just in auto mode.

 

I have had the 14(?) onboard computers checked with a VW/Audi diagnostics machine. Nothing wrong was found but I think these tests were mainly engine related.

 

Has anyone else got this issue? Any questions please ask.

 

Thanks