Hello Everyone,

I have been hearing an engine noise while accelerating lately.

When pushing it at or above 3k rpms I hear a “nun-nun-nun-nun-nun” rhythm over the normal engine acceleration. I don’t remember hearing this in the past. Does anyone have any experience with this sort of noise or do you think I should have it checked out?

2004 Grand Prix
3.8L V6 (non-super charged)
110k miles
Plugs and wires changed a couple years back

Thank you!