In any other circumstance I'd stick with it and get it running sweet again, the thing is, I have another car (a golf!) and I'm just finding it expensive to keep two cars now, as well as that my work takes up all of my time, I just don't have the free time to deal with it.
As to running rich, this is what I have been told by the mechanic at work, he said something about checking and cleaning out the air system, my mechanical knowledge is not great so I don't know the ins and outs of it. The reason is due to some sooty deposits and occasional white smoke from the exhaust.