Ok. My idle is 850-900 and rock steady but the idle valve is bypassed so not really comparable. Never seen the 1500 (sometimes stays at 2000) rpm idle issue ever definitely solved, otherwise I wouldn't have bypassed it!
Do you mean a slight fluctuating idle when you say vibration? How crusty are your intake manifold and throttle body gaskets? I think you've changed all the vac hoses already? Do clean the idle valve and/or test a second hand one.
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MY97 940 CD LPT Super Sports Edition 2 Turbo, Midnight Purple, 175,000 miles.
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