Sounds like a hydraulic problem.
Check the rubber flex hose that connects to your slave cylinder. The rubber gets "mushy" over time, it can collapse internally and block the flow of hydraulic fluid back to the master cylinder when you let up on the clutch pedal. If the hose has deteriorated, the fluid flows OK to the slave when you push down on the pedal, can't flow back freely when you let it up - it feels like the pedal is "sticking", as you describe. The hose might look fine on the outside... the "collapsing" problem is inside of the hose.
Could also be your master cylinder leaking internally. Fluid can leak past the seals inside the mc, leading to problems when you have the pedal depressed for any length of time (like waiting for a red light).
Slave cylinder can develop leaks, too - but fluid usually leaks out, leaving spots on your driveway.
Worst case scenario - a problem with the throwout bearing or pressure plate. It's "worst case" because the clutch has to come out of the car to fix it, a big job. This is unlikely. You don't have very many miles on your car, clutch components can last MUCH longer than 105 K as long as they're not abused.
Here's what I'd do:
** Always do the cheapest/easiest things first, then move on to the more involved/expensive! Before replacing anything, be sure the fluid level is topped up. Make sure there's nothing interfering with the movement of the pedal itself. Bleed the system to be sure there's no air in the line.
** Replace the clutch hose first. It's the easiest and cheapest. Bleed the air out of the system and go for a drive. If you still have a problem, then...
** Get your master cylinder and slave cylinder rebuilt. New fluid, bleed... check it out. Should be fixed. If not, it's probably an internal clutch problem. Hope your on good terms with your favorite mechanic!...
Good luck!
tck...
tck...
Thanks I'll take your advice and share it with the mechanic who hasn't found the problem yet.
Capk