Severity: High
Engine Shaking or Rough Idle
Engine shaking is most often caused by misfire, air leaks, fuel delivery problems, dirty throttle body, or engine mount issues.
Most likely causes
- Misfire
- Vacuum leak
- Dirty throttle body
- Fuel injector imbalance
- Worn engine mount
First checks before replacing parts
- Scan for misfire and fuel trim codes
- Compare STFT/LTFT at idle and cruise
- Inspect intake hoses and PCV lines
- Check plugs and coils
- Inspect engine mounts
Related systems
- Ignition
- Air intake
- Fuel trim
- Idle control