What would cause that? This is a friend's car. It started doing this recently after glow plug and fuel filter replacements. I'm going to take a look at it in the next couple of days--sounds to me like he probably bumped a vac line somewhere. It runs well otherwise--starts, idles shuts down and revs nicely. Just seems to start off in gears way too high causing very sluggish town driving. Any help is greatly appreciated. Thanks!

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1998 E300D, 287k, barely broken in.