[MBZ] Stiff throttle

[andrew strasfogel]

The throttle (gas pedal) on my son's 1985 300D is surprisingly stiff and
hard to push with my foot compared to my every day 1983 300TD. As a result,
it seems r elatively "logy" and slow off the mark. Would lubing the throttle
linkage take care of this or could there be some deeper significance?