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For finding vacum leaks try a spray bottle with water set on stream. The engine will stumble if you spray on hose/port or gasket edge that is bad. As far as the rumble check the center carrier bearing on the driveline. I would recomend just pulling out the drveline then checking it. As far as shaking have you checked the trigger points for the fuel injection? These are located below your ignition points a lot of non Mercedes savy mechanics miss those. Valve adjustment is important to but if it is your first time on this type of engine get a pro to do it or better yet show you. Regards,
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