corsa problems

[terrible___1]

hi all was driving my girlfriends corsa and it keeps cutting out,ive replaced the distibuter,idle control valve,leads and plugs.I cant think of anything else to change any help would be good.the car is a 1.2 engine code c12nz M reg

cheers in advance

rob

[ck]

cuts out when the clutch is depressed? like at junctions ect

[terrible___1]

yer and when im slowing down for traffic lights

[ck]

does your speedo still work fine?

sounds like similar symptoms to a broken speedo cable or faulty VSS (vehicle speed sensor)