the sensor that tells your engine when the clutch is engaged will be located somewhere on the transmission itself depending on the year. my 96's was right on top under the battery.
Hydraulic Hydraulic
check your clutch and brake fluid
A person has to use the right type of fluid in a vehicle to help it run its best. The 2002 Mitsubishi eclipse RS uses DOT3 brake fluid as clutch fluid.
http://www.innerauto.com/browse/year/1995/2001/mitsubishi/eclipse/repair_manual/?ref=S1161368748W453914ac6fba6&label=95-98+99+00+01+Mitsubishi+Eclipse+Repair+Manual
dot 3
Dot 4 brake fluid
If its standard then more than likely its the clutch.
The inner seals have failed. You need a new clutch slave cylinder.
If you go to autozone.com you can view repair guides online free.
Try to put your car on the parking breakes.
2000 Mitsubishi eclipse 2000 Mitsubishi eclipse 2000 Mitsubishi eclipse
You can feel it. You can feel the gears disengage. You can't mistake that feeling for anything else.