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Hi guys, I got a used Suzuki Swift 2007 (1.3L Petrol engine) a month ago and it is my first car. I am experiencing a rough idle when in neutral. There are oscillations in the tachometer +-400 RPMs. This mostly happens when I am stuck in traffic. At first, I thought the spark plugs were the problem and changed them, but the issue persists. Has anyone experienced the same problem? Any help/suggestion is appreciated! Thank you in advance!
 

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look if the throttle body is working properly or its dirty, if its dirty it can cause that problem, and also you can check if its the maf sensor, disconnect the maf sensor from the stick and turn on the engine, if it runs smooth and without any problem so the sensor is dirty or broken.
 
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