Crozo, I've been having a similar intermittant fault . . . So far I've replaced Coilpack (had a crack in it), ignition leads and platinum plugs to no avail. I then replaced the ECU relay (#109) and the fuel pump relay (#679 I think) which came to £31 and so far it hasn't played up all week. Another part to this is that sometimes the car willnot start, it cranks perfectly well for ages but takes a few attempts before it starts but as I mentioned above, I've not had a problem since replacing the relays.