Help Engine Misfire runing rough

[Graham Barker]

I had a similar fault. I made all of the replacements that you have made without success. Eventually the fault was traced to my Lucas distributor. There was a poor electrical connection through the screw that holds down the contact to the distributor base plate. This screw has to make electrical contact with a brass earth connection within the base plate. Electrical resistance increases as temperature rises. Hence the motor was fine when cold. The solution was a new base plate for the distributor.