General signs:
* Engine vibrations at idle and during acceleration
* Creaking, knocking or rattling noise from the engine compartment
* Engine sagging when changing gears or braking
* Slow gear shifting
* Increased fuel consumption
Specific features for cars with automatic transmission:
* Difficulty shifting gears
* Gear slip
* Jerks when changing gears
* Excessive vibrations when shifting gears
*Noise or vibration when engaging reverse gear
Other possible signs:
*Cracks or tears in engine mounts
* Loose engine mount bolts
* Oil leaks on engine mounts
* Mismatch between engine and gearbox