Had a read about, seems it could be a number of things. People have suggested a clean out of the intake as it may have a carbon built up. Watched some videos but don't fancy trying that myself. Anyone know of a good specialist in or near leeds that could do it?
Thinking of selling up but need to get it sorted first.
What's the engine? If it is the V6 diesel i.e. 3.0TDI then there are two motors, one on each intake manifold. Each has a connecting rod to the swirl flaps. They wear and so give 'implausible' signal to the Ecu. Some chassis numbers there are repair kits for but some like mine need new manifolds, a wallet basher!
Hope that helps.
I had that on my a3 1.8 160 tfsi and it ment replacing the whole intake manifold at £400.
I had it the ecu reconfigured as it didn't make much difference to the running of the engine still going strong now