my car won't move when gear is engage. I can easily engage the gear while engine is running , but the car is not moving. The clutch pedal or master cylinder are working properly. I turn off the engine and engage the gear, and when I push my car from behind, the car is pushed easily. Just like when its neutral and as if the gear is not engage. What is the problem? Is it with the clutch & pressure plate, or the gear linkage?