The fact that hindi sliding clutch yan...baka hindi nga clutch....but that would be difficult to assess....if I were you, having the clutch checked would be a better option than getting stranded because of a faulty clutch (magkano ba mag pa-tow at an cost ng abala sa tumirik na sasakyan).
Philpogi,
Does your car have engine rev problems at idle? Kun meron din at ito ay carburated engine, it could be dirty carbs....baka me konting bara ang carb jets....try carb cleaners and some oiling of the carb mechanicals too.