MISFIRE ISSUES
​Symptons:
  • Rough acceleration
  • Rough idle
  • Vibrating
  • Check engine light
  • Slow acceleration
  • Sound of engine has changed
​
Causes:
  • Bad ignition coil / distributor (older car)
  • Bad spark plug
  • Intake manifold gasket leaking
  • Low fuel pressure
  • Injector problems
  • Low compression / damage inside engine
  • Wrong air-fuel mixture
  • Bad sensors - MAF, oxygen, cooling temperature etc
  • External temperature excessively hot (weather)
Experiences when this happens:
  • High revs
  • Very hot day
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