similar problems with mine... trying to sell it to get rid of it as it's one thing after another AND only an 06 plate.
th garage have changed the de-phaser and cam belt, new ignition block / coil and the problems you are reporting sound like a dirty throttle body OR failed air math sensor... as they have told me when I reported very similar symptons, although they are reluntnent to change these as these don't show up when the plug in the fault diagnostic equipment, when i asked would they if these parts were broken, there reply was no!
Anon
June 2009
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.