What Causes a Car to Sputter and Idle Rough

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What Causes a Car to Sputter and Idle Rough

What causes a car to sputter and idle rough? A vehicle's engine that sputters and runs rough while idling is an indication of misfiring of one or more cylinders because when the cylinders misfire the vehicle's engine balance will be disrupted.

There are many possible reasons that cause the engine to run rough and may result in engine misfiring but the most common are:

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 in fuel starvation and creates misfiring.

What to do? 
The Truth About Cars
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First is to replace the spark plug and the spark plug wires because it is the easiest to do and usually 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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