If the vibration is observed when the car is at rest, engine is running, brake pedal is depressed and is on D, check the following:
- Idle speed must be according to the specification.
- Vacuum leak.
- Spark plugs condition and air gaps between the electrodes.
- Fuel system and injectors.
- Engine and transmission mounts for looseness or are broken.
- Muffler and its foundations.
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