What led you to replace the plugs? Was there a prior issue?
Also, the noise you hear could be a vacuum leak. Make sure the air box and intake tube are fully connected and tight. If either is loose, the humming sound could be what is heard. Also, the sound would get louder the more throttle you give it.
Is it loud enough to record and upload it for me to hear?
If you look at the attached pic, it shows what I am referring to. Please make sure none of the connections are loose, cracked, or disconnected.
Let me know.
Friday, April 30th, 2021 AT 8:20 PM