hey im still stuck with my car

it is a vx berlina ecotec

from cold it runs and idles fine then after a while itll sputter, rev really high without touching it and feels like its misfiring. When this happens it almost always stalls. petrol also comes out of that pipe thats under the fuel filler nosel sometimes. when this happens it also blows black smoke.

things i have changed

*coilpack
*leads
*spark plugs


i have also changed the fuel pump assembly but i changed that before this happened
before i changed the pump none of this happened. i dont know if that has anything to do with it but id thought id mention it

cheers mat