My 1982 xjs HE V12 is experiencing a strange start up trouble lately. When the engine is hot or warm it starts up fine. But if it is cold (over night parking), it still starts up immediately, but it feels and sounds like some cylinders are struckling along. It is only so for a few seconds 5 seconds at most before the engine sound smooth and normal again. I have no other problems along with this, ether while idling or when driving.
It is only about 1 year ago that it has had a full service, new oil, sparkplugs, distributor ....etc after having a restoration of the cooling system.
Niels Olesen