Hi, i have a 2004 1.2 cleo and i think im having the same problem, some days its fine and other days i can be driving down the road and the revs fluctuate, it judders then cutts out, it then wont start till ive left it for about 15 mins, ive had it in a number of garages and no one can seem to identify the problem, also nothing comes up on the diagnostic test! its really un-reliable and daren't drive any further than round the corner!
Have you looked to see if the
cover is loose and rubbing? It's at the back of the engine, behind the main block. Does it move about and rock when you move it? There are wires going into it on the drivers side of the box and some of them were rubbed through on ours.