Been messing with the car as usual and noticed the coil has something 'wobbling' around inside. Not noticed it before. Have I a problem? [besides the obvious] If so, what should I get as a replacement? Cheers.
The coil should be filled with oil; if you can feel it sloshing around inside then some of the oil must have leaked out - the coil is probably on borrowed time. Might be a good idea to start sorting out a spare just in case.