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Could be a bad diaphram in the EGR. Pull a vacuum with a MityVac or similar and see if it holds.
If the diaphram is bad, I'd pull and plug the line to the EGR to keep dirt out of the vacuum system. Otherwise replace the EGR valve.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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