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I had this problem for ages, I have it fixed now. It was ignition related.
My other suggestions would be
1. Dont throw away your old original leads if you fit new ones which you think are better unless you have evidence to suggest the old ones are no longer functioning correctly, e.g. high resistance. I bought a set of new leads just because the originals were old, it then developed this misfiring problem.
2. Check that your leads are not in contact or will not come into contact with anything metal. All the clips which hold the leads got broken by the new leads mentioned above so the leads would hang slack, but not visually touching anything. When the bonnet was down and the car came on boost the engine would move on its tired mounts and cause the leads to contact with various metal objects, these included the heat shield, bypass bracket and the coil lead on the IC piping. Im not sure which of these caused the problem, but replacing the clips actually prevented the misfiring and it has been fine for the last 6 months.
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