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Discussion Starter · #1 ·
I typically change my spark plugs yearly; this Spring I spaced out and forgot; performance degraded slowly but surely. Slight stumble at WOT, soggy gas pedal response, less overall "zip"...

Threw in a new set of plugs (Volvo OEM) and like magic, throttle response was back, no stumble at any throttle opening at any RPM, and more power!

I chuckle when I see endless threads about engine performance issues and no one gets to the obvious solution; first change your spark plugs.
 

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Change after the service-book and you will never have any problem?

20 000km between the services.
 
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