I posted my Xj6 problems on the wrong page it’s a1990 3.2 so here goes .
Bought this car and ran it home over 60 Miles ,no problems.
Next day spent some time in traffic,car didn’t overheat but eventually went into what I thought was default mode but eventually lost all power.
Switching off then restarting gave me a short respite but same problem.
Limped home.This feels like a fuelling problem I will start with a new filter.I have been advised there is no drain plug on this model which has only one tank.The car has been stood for a long period as it’s only covered 15900 in 28 years so I guess there will be stuff in the tank.
Let the forum know the eventual outcome.