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Engine Misfire or Rough Idle: What an OBD Scan Tells You in Seconds
A rough idle or lurch usually means one cylinder isn't doing its job — and it's one of the fastest things to actually diagnose.
The symptom
The car lurches, shakes, or feels unsteady at idle.
What's causing it
A cylinder isn't firing properly — commonly a worn spark plug, faulty ignition coil, or a clogged fuel injector.
What to do
An OBD scan identifies the exact cylinder (codes like P0301 for cylinder 1). If the check-engine light is blinking, stop driving — an active misfire can damage the catalytic converter.
Run a free scan with GetAutoSure to find the exact cylinder.