Hi all, Thanks for all the different advice.Took the car into Nissan this morning and had one of the techies take the car out for test drive. Yes, he did find that there was a slight shuddering when gently pulling away. As the car is still under warranty they have asked me to book it in for a couple of days. He believes it might be that at idle revs about 650rpm, the car is idling it bit low. We did drive a brand new one to compare and what a difference(very smooth). Hopefully they will find the problem and sort it out..Fingers crossed!!