When ever the car is cold and I am driving or stood still just feathering the throttle the revs seem to do what they want to do which is jump around. When stood still they just jump around until I rev over 2000rpm, when driving this causes the car to buck and jerk.

Anybody any suggestions regarding what to test check or replace.

Once the car has warmed up the symptoms are not nearly as bad and hardly noticeable.

Cheers.