Received an email from a fellow Ka-er with an uneven idle. I reckon it could be the HT leads, but I'm not especially knowledgeable about funky electrics, I prefer glow plugs... :)
Symptons are a reluctance to start from hot (doesn't fire), an uneven idle when switching circuits on and off or moving the steering at very low speeds (says it occasionally struggles and approaches stall). Ka has covered 49K, sparkies changed at the recommended Ford interval (so last at 30K). Next service due at 50K, heh.
Now I'm thinking HT leads, 'cos I believe these start to go a bit funky when underbonnet temperatures are higher (hence the hot starting issues), and can cause some instability when idling.
Am I on the right lines? Like I said, I prefer mooching about with glowplugs and relays than horrid little spark plugs. :)