Don't no if I sead enything last week but she stopped working
altogether. She starts to sound like one of the spark plugs wasn't
sparking. I got about 200m up the road and stopped to have a look
under the hood and she concked out.

So i'v got new HT leads, spark plugs, distributor cap and rotor arm.
Hoping that will help. Post photos of the old cap, prity bust up.