idle fall down from 800 to 600 rpm

2000 MERCEDES BENZ VITO
130,000 MILES
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JOSSI
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Dear expert,, vito 110 cdi, special noise in the same time, max. rpm at this time max 3000. What can be the root cause?

if the idle fall down to 600 max rpm is 3000, no more.
at the next moment the idle is ok again, the rpm can be run up to 4500-5000
May 2, 2012 at 8:09 PM
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FIXITMR
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check for vacuum leaks.
May 2, 2012 at 9:45 PM