GT JTD rough running under load
Once the car is warmed up, any load exerted on the engine (Accelerating) causes a significant jumping/vibration.
This jumping/vibrations occur at any speed and in any gear and stops when the accelerator is released and restarts as soon as the engine load is re-applied.
My dealer replaced the EGR valve which did nothing then after a test drive with them they said this is a tyre problem and identified the problem tyre. Both local tyre centres say there is nothing wrong with the tyres.
Car has done 20K miles.