Great minds think alike! A friend of mine had a misfire on his Austin K7 lorry. We ran it up in the dark and it was easy to see there was a short in one of the HT leads. They had screw on ends. Re-did the end connection and all was well. It took us a couple of hundred miles around Normandy and few tanks of fuel to finally get rid of the sticking brake problem though.

Location: Essex/Suffolk border

Apologies, it was a K6, as can be seen here:

http://miliblog.co.uk/?cat=102

I hope you get it sorted. I would still look at the rotor arm, particularly if its a riveted one, as it could be showing early signs of failure.

Location: Essex/Suffolk border

Nick, Slackness i was referring to was the fact the rotor arm can be twisted back and forth as if the drive gear is a bit worn.

I will try running it in the dark to look for any sign of external sparks.

David

Thnak you for the advice on the rotor arm, I did fit a new one, when I replaced the distributor cap..

David