What happens when spark plugs are bad?

Related questions

1. What are the benefits of Iridium spark plugs?
2. Does spark plugs increase horsepower?
3. How tight should I do my spark plugs?
4. What is the advantage of using iridium spark plug?
5. What are spark plug gaps measured in?
6. Should I use anti seize on NGK Spark Plugs?
7. What do NGK Spark Plug numbers mean?
8. Do you really need a torque wrench for spark plugs?
9. Will a loose spark plug cause a misfire?
10. Which spark plug is better iridium or platinum?

Tags

1. #encompassing
2. #idling
3. #spark
4. #cylinder
5. #sound
6. #cause
7. #jittery
8. #indicate
9. #vibrate
10. #while
11. #problem
12. #rough
13. #misfires
14. #vehicle
15. #which
16. #engine