tabocat,
i was reading your post about how you changed the plugs and wires for a rough idle and it went away (dated around 5, 2010). can you tell me more about what happened and what you did?
My 560 has a rough idle if the coolant gauge registers anything below full operating temperature. dealer wants to change the wires and plugs, since it is misfiring, but I don't see how ignition misfire is related to coolant temperature.