First post after n00b intro so be patient!
I picked up my '95 Vento on Monday knowing it had this problem but thought it would be a simple fix. It vibrates through the steering wheel at idle and I can feel a slight skip in the ignition timing, like a miss but an irregular one. I checked the sparkplugs and they seem pretty clean, number 1 and 4 were dirtier than the middle two though.
Is there anything else I can check? Is this common?

By the way I consider myself inexperienced when it comes to motor stuff, I've only ever done oil changes and brakes and the likes.