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Intermittent engine hiccup S40-V40 2004

Don't know how best to describe this.

Occasionally as once a couple of days, with the car stationary and engine running for instance at a red light, I can feel a hiccup or judder momentarily coming from the engine. Quite brief (few seconds) and too fast to note if the rpm drops or not. If this car had a heart beat, I'd say it just had a missed beat.

Otherwise the car is running well.

Is this a symptom of a misfire? Where should I start looking?

Thanks.

2004 V40 110k km.







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