Does anyone know what this is..

I took the cossie out 2 day everything was fine with no problem's then when i started to put my foot down it started to pop and fart and wont pull over 3000 rpm.

On tick over its lumpy and its puffing out black smoke on tick over and when you rev it.

its also got a very strong smell of petrol.

It's lumpy when it revs but when you rev over 3000rpm its fine. but if i drive it over 3000rpm its missing and wont have no boost and need to take your foot off.

has anyone else had the same problem or help with what to look out for.

thank's