I'm not exactly familiar with your car, but what harm can come about by cleaning all the linkage joints. Remove themone at a time, clean each in hand, and reinstall. I would be careful around any of the electrical contacts etc.

__________________
....just drive'em!
'89 300TE White w/Blue, 152K SOLD!
'93 300E Blue w/Tan, 154K SOLD!
'01 E-320 4-Matic wagon, 130K
'67 Vette Conv. White w/Blue, 217,421K