Dynamique stuttering

[Don]

1.2 52 plate Dynamique, when the car is driven slowly, every now and again, it splutters and the revs bounce from about 500 rpm upto about 2,500 for a few seconds, then the yellow light comes on, then it rectifies itself.

The yellow light has like a spring shape and the graph inside a box...

Any ideas???

 

[ThePea]

Coil pack is probably knackered. I think their fairly easy to replace