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Sounds like a very large vacuum leak. It may be running OK at higher RPM because the vacuum leak is a relatively small amount of the total air going into the system. But below 3000 RPM a vacuum leak can be a large part of the air, and it's just running too lean.
Do you have a pop-off valve? Could it be loose? Are any vacuum lines disconnected?
Maybe a picture or two of your engine will help with some diagnosis.
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Rex
1975 911s and 2012 Range Rover Sport HSE
1995 BMW R1100RS, 1948 Harley FL
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