Does it do it when its cold? Mine has the same problem at the moment. (2009 200)
Just warm it up before you drive it, sit with it at 2000 on the dial out of gear until it starts to splutter, let it splutter with your foot in the same position until it returns to 2000 and kicks up above it. It will be fine to drive after that.
If you drive with it spluttering (as you probably know) its a glorified death trap.
Is your engine light on, along with spanner and check emissions?
I'm going to ring harrats wakefield up about it tomorrow and see what they think. If you have the same problem (which it sounds like you do) I'll let you know what they say.