Newbie needs help with black smoke fuel smell

Hi everyone,
I need some advice. I haven't bought the car yet but am looking at it. I looked at Micra K11 (1.0L) today. Seems great except that When it was first started there was a strong smell of petrol for about 5 minutes. Also even once the car warmed up, when it was idling, there was black smoke coming from the exhaust. Not very thick,but definitely visible. Also has a slight misfire / lumpy idle. Any ideas what this could be and should I rather stay away from it? Thanks
 
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