I'm in the process of trying to get to the bottom on an intermittent misfiring fault when hot on my 1972 TR6. It runs fine when cold/warm but sometimes when hot the dreaded misfire starts at anything over 2800 rpm. Below this and again its fine hot or cold.
New electronic ignition, distributor cap and plugs hasn't helped. I believe the coil was replaced at the same time and wondered if it was the right one. There are no markings on it and the terminals are shiny new so I think it was replaced.
Was this the right one though. I've measure the resistance across the low voltage side and get 3.3 ohms, indicating a non-ballast type. Is this likely to be the right one?
I'm about to change the HT leads as well.