Your description of the fuel screw is correct. Small increments can have a large effect. Sometimes it can be hard to get it dialed in after opening up the cover, especially if the outside throttle arm plate was not replaced on the splined shaft in the exact same position.
Did it do similar before the IP rebuild? Or did this start after the IP rebuild?
What does it do off-idle, and at lower RPMs (< 2000 RPM)?
They all emit some visible smoke at all RPMs. One of mine more than the other as it is an oil-burner (~1 qt./700 mi.) We are dealing with essentially 1970s technology.
TDI technology is much newer, not a fair comparason.
What was broken in the IP, the sliding fuel collar way at the bottom?
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1985 744 gle d24t
1985 745 gle d24t
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