still got probelm...inlet manifold has been cleaned and looks like new. cleaned egr. fitted new inlet manifold flap shuts down nice and quiet. changed temp sensor in plastic pipe under tandem pump. replace thermostate and had coolant flushed m8 says ticks over still lumpy so will check with vag com in morning .. but think may get a another injector and get it tested and cleaned and fitted and see what happens as it's only injector one that goes out of tollerance.....