I noticed yesterday that when the engine is cold the fast idle is a bit erratic and the lighting on the TID (and dash and centre console lighting when swithed on) dims and brightens with the rise and fall of revs, it`s not a misfire, a bit more like the engine is hunting. It only happens when the engine is cold and runs perfectly apart from this but I can`t understand why the engine problem would affect the lights, if it was a earthing problem or alternator I would expect it all the time.
Time to get a haynes manual
the car is a 3.0 MV6 manual BTW
TIA