FWIW; mine had same noise with poor idle but great acceleration.

I found not ONE, not TWO, but THREE!!! Loose plug boots in my quest to cure the sudden rattle.

I checked the plug boots over and over to ensure they're locked on.

Test drive went well and rattle/stumbling idle have cleared out. No stored codes. No CEL.

Hope this helps anyone with similar symptoms. Check your wires often. I used to after new plugs installed, but they were always gudentite!