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Please help

A friend has a Lotus Elan which keeps cutting the revs under acceleration. The knock sensor has been changed but has not made a difference. Some time ago the ECU was remapped and it is running slightly higher boost pressure, but this problem developed almost a year after the work was carried out. He has tried millers, but to no avail. I know this isnt an Impreza, but hopefully the cure for detonation may be the same

Thanks