Hi - I've got a 150bhp twintop 57 plate that wont start. It fires up, sounds like it is missfiring then stops after 2/3 seconds. It is at the dealers who cannot find any fault code in it's brains so they now suspect fuel contamination [unlikely]. It also broke down in April this year and had a new switch under the clutch pedal [common fault apparently], something to do with the keyless start system but that time it wouldn't even fire up.
Anyone got any ideas or had a similar fault?