Someone else on here is having misfire probs, on a 180, think they are after thottle position sensor and idle control valve, off a breaker.
Be interesting to see if you can solve this one, might help them.
Thought your silver one looked doggies bolxx, trouble is if it were mine I wouldnt want to use it. Wife always moans when we have a hike from the furthest part of the supermarket car park. Lucky we have her Punto and that usually ends up doing the shopping run, but I get caught out sometimes in the ZS.
Usually come back and have a 4 x 4 or People Carrier full of kids parked 6" away from the ZS, think they do it on purpose!!!!!!