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I have had this problem and it turned out to be gummed injectors.
At idle/part throttle the small a mount of fuel dribbles out rather than being atomised correctly by the injector. At decent throttle the extra fuel atomises better and masks the problem.
Its easy to fix, get the local Bosche agent to flush them through, they will also check the atomised spray pattern
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Bruce
83 SC
94 993
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