Anyone else had a deep growling noise/vibration when the engine is pulling hard through around 1800 to 2000 rpm ? The car is a 2.2 diesel auto, 09 reg. if you use kickdown it's ok, it only happens when in 6th and you accelerate steady through 2000 rpm but not enough for the box to kick down. It sound like something on the induction side or airfilter housing ? it can't be replicated just by revving the engine at standstill. Thanks