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Upon reading this thread I would have instantly said distributor caps and inner cracking. I have exactly the same issue in terms of running fine from start, then 15 minutes after misfire, heightened by engine off for 10 minutes then restart.
The cause is definitely tracking in the distribs as once this is cleaned no problems for 4-6 months. The reason why the issue is exacerbated after leaving the engine off for 10 minutes is presumably the build up of moisture in the cap feeding the tracking issue!
However, you story adds yet a further dimension - and sorry I can't offer any advice.
Lea
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