Well it's running and it idles somewhat more evenly between both cylinders. Before I would have said it idled 70% on the left hand bank and only 30% on the right hand, from the noise differential from the exhausts. It blips more eagerly and cleanly than it was doing. I will road test it tomorrow morning to check if I really have cured the full throttle misfire at 4000 RPM or if I need to order a fuel pump replacement kit from Glencoe.
Wilson