smashy

Hi peeps recently braught my sti 3 and car has a light random missfire sometimes...ive not actualy got round to doing plugs yet or checking anything else ...but as it was dark earlier i decided to have a look to see if any of the leads were arcing......but to my surprise looking at the coil pack along the leading and rear edge you can clearly see a wafer thin line of arcing.Has anyone else looked at theirs in the dark?I suspect its a tired unit and will replace it ...but kinda interested if anyone has a recent replacement that does this before i get it:P