Hi guys car has just started to develop a shudder when I pull up at junctions traffic lights etc doesn't happen all the time when I take off throttle unresponsive for a second or two then kicks in have reset throttle response no good sometimes feels as if car is going to cut out has been suggested could be a faulty spark plug any thoughts I have a 2007 roadster with 75,000 Km recently changed oil filter ,oil air filters but doubt that's the cause

 

Make sure the rear of the air filter box is snapped in place on the air intake to the throttle body. Recently had the same situation after removing and replacing the filter box/engine cover.

 

Hi thanks mate checked the cover looks like you might be right took it off re positioned it and it seemed to snap into place will try it tomorrow touch wood that's all it is