The Engine
I spent most of the day swearing at this engine, changing vacuum hoses, plugs, and fuel injectors. End result? It now runs for about 15 minutes before spluttering to a stop. Which is actually an improvement.
Given that it doesn’t run properly again until it’s cooled down, and that there are signs of the fuel/air mixture getting too rich when it fails – the blame is currently being pinned on a seal somewhere which is failing when it heats up – possibly on the inlet manifold. Stripping that down is a bit beyond me though. A job for the garage I think.