Engine knock after replacing spark plugs 2005 Kia Sedona
Hi, I got the spark plugs replaced for my 2005 Kia Sedona minivan as regular maintenance, but immediately after that, the engine started making loud knocking noise and shuddering.
The car was regularly maintained and just had oil change and routine inspection about 1 week ago. And the NGK spark plugs definitely fits the car. Could you please give me some idea what might caused the noise? Thank you so much!