What causes engine RPM to fluctuate?

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Tags

1. #likely
2. #common
3. #amount
4. #erratic
5. #measures
6. #device
7. #injected
8. #sensor
9. #caused
10. #malfunctioning
11. #factors
12. #engine
13. #dirty
14. #found
15. #appropriate
16. #cause
17. #various