I think its more likely the dog bone mounting. The coils seem reliable. If they fail its a misfire or EML in the dash, or poor running. I chnaged one on our 169 panda when the EML came on. It was fine up to 80mph and then always the light came on. It has cured this. We also had an error code for misfire. Misfiring is quite obvious and I think not your problem.
Try a new set of ignition leads first anyway. These are more prone to fail. They are also cheap.
Some cars have a throttle damper which slows the closure or the butterfly and if this plays up it causes jerkiness. A sticky throttle body might be a possible cause. Try cleaning the thottle body as this is just a can of clener and half an hours work.
If you are really intent on a coil I have one in stock which I bought from a member on here. He sold his car and took it off after a months use, still in the box which I will pass on at cost. It looks brand new. Im not in a hurry to sell it but suspect I will not need it for years. (Famous last words)
). I last change the leads a year ago which it has improved slightly, but I'll definitely look into cleaning the throttle body and the dog bone mounting. I'll report back to you. Thanks again for the response 
