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FWIW: I had a similar problem in that RPM range, although not quite as severe or consistent. After a year or 2 of screwing around, I pretty much pinned it on worn/leaking throttle shaft bushings because that was the only thing I could find wrong with the fuel system. Once those were rebuilt - no more problems. Strictly an empirical observation.
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1983 AUDI Turbo Ur quattro
1987 PORSCHE 944 turbo
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