For sure. Check all the vacuum hoses, and also, the rubber air intake plenum between the air meter and the manifold, and the injector cup seals. Those are all places known to be likely causes of a vacuum leak. If you rule out vacuum leaks, you might have a dribbling injector or two.

Have you done a compression test on the motor yet? Are all eight cylinders in spec?

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition