What causes a car to sputter and idle rough? - The Truth About Cars - Navara

What causes a car to sputter and idle rough?

What causes a car to sputter and idle rough? An engine that sputters and run rough while idling is an indication of misfiring of the more of more cylinders, because when the cylinders misfire the engine balance will be disrupted.


There are many possible reasons that cause the engine to run rough and may result to engine misfiring but the most common is:
1) Vacuum leak
2) Bad spark plug or spark plug wires
3) If the car is equipped with fuel injector another possibility is that one or more injectors are clogged, which resulted to fuel starvation and creates misfiring.

What to do? 
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First is to replace the spark plug and the spark plug wires because it is the easiest to do and it will solve the rough idle problem most of the time. If the problem still occurred, bring the car to the repair shop and asks the mechanic to check the engine and repair if necessary.

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