Bloody U13's!!
Looking through this thread, to my MUCH earlier posts before I had a U13 with a KA24DE, is a bit strange considering I just had the same issue of my Bluebird cutting out on the highway for no apparent reason!
Read through this thread, opened up the distributor and what do you know, shitloads of oil!! Off to buy some contact cleaner/degreaser now and then drill a hole in the bottom of the cap so the oil can escape.
Stupid friggin U13 distributors!!