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[Welung666]

Just fitted new Bosch ignition leads (£25) and done a test drive.  Problem solved!  It was the broken lead. Now, the car runs at 60 mph at 2000 RPM compared with 50 mph at 2000 RPM previously, and without any jerkiness/misfires.

Glad you got it sorted Jampy, not too expensive either which is always nice

[Jampy]

I have now dissected the failed ignition lead.  The break was where the lead connected to the sparking plug boot.  What seems unbelievable is that the last inch of graphite conductor had reduced to dust, and then only enough to coat the inside of the surrounding one inch length of flexible insulator.  Yet such a lead created a spark in the cylinder most of the time.  Incredible!!