Originally posted by 98csvt:
I replaced the VSS. It doesn't only do it when I am at a stop light. It does it when I drive also.



Get an OBD-II scan tool and pull up the vehicle speed and see if what the scan tool says agrees with what the speedometer says...if not, maybe the speedometer is messed up... (The scan tool is will pull the data from what the engine computer sees as the current VSS reading).

I'd guess that Contour instrument clusters aren't too expensive (under $100) from the wrecking yards, so maybe it'd be worthwhile to try swapping it out...