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Old 01-29-2003, 02:11 PM
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sixto sixto is offline
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
It never hurts to check the line from the manifold to the overboost protection valve and from the valve to the ALDA.

You also might temporarily (ahem) disconnect the vacuum lines to the EGR valve and air recirculation valve, if equipped, to see if the problem lies in one of those systems.

91 300SE
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83 300SD
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