What it can mean
A flashing check-engine light, fuel smell or severe shaking raises urgency.
What to do next
- Check for warning lights and retrieve codes and freeze-frame data.
- Note whether the symptom changes cold versus warm or with accessories on.
- Avoid prolonged driving with a severe misfire.
Possible causes to test
- Misfire
- Vacuum or intake leak
- Fuel delivery issue
- Dirty throttle or control fault