Hi,
I had the same problem. the problem was the AVR valve, its something to do with when you put the clutch down or something (sorry i'm a girl)
It cost me £110 to get mine fixed, to find out you can just clear the valvel out with fuel injection cleaner (which only costs a couple of quid from any garage).
I would try that first before taking it to the garage.
Jennie
December 2006