I believe that lubricating the throttle linkage is part of the standard maintenance routine (e.g every 15/30K miles). If there seems to be "stickiness" (inconsistent movement) vs. resistance then you should ensure that the throttle linkage has indeed been lubricated.
<DIV><FONT size=2>Just bought a 96 E320. The car is great and in
pristine condition. However, the gas pedal seems to be a little
sticky. Takes a bit of effort compared to my other cars to get it
going. Is this just a Mercedes thing or is this something that can be