E46 shudder

I have a 2003 E46 320CI M Sport coupe. Every now and then a strange occurance comes on. It is difficult to know where to start to look for
the problem. I can brake change down and accelerate and sometimes the car then starts to jerk with what appears to be a misfire, the only way to clear it is to dip the clutch, flip the accelerator, let the clutch up and accelerate away.3 times when this has happened I have driven the car straight to the local BMW dealership and they have carried out a diagnostic check which has shown nothing amis. Has anyone else had a similar problem. The car has done 18200 miles and has had all necessary service checks as and when required.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.