look like current leakage from the rubber at the bottom of coils which holds the plug. Check those rubber for minute hairline cracks.
The symptoms which u described were there in my brother's car and mechanic isolated the problem by slightly pulling out each coil from the plug chamber. On each pull out the car started vibrating like anything but on one coil car didn't show any vibrations and mechanic put it out completely for inspection and there it was the rubber which is attached to the bottom of coil and holds the head of the plug was having a hairline crack which was leaking current. Checked from toyota , that small rubber was for 1500 PKR but then we got a kabli rubber from shoba market for 300 rupees and car was back to normal.
The main symptoms of that car were.
> Erratic fluctuation of rpm esp when cold started
> A slight delay in vehicle's response when throttle was pressed .
PS I don't know if it can be applied on your car or not as the car I had experienced with was a 1.3L 2012 GLI and yours is an altis.