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All, The dealer found the culprit! There are two fuel lines coming from the fuel pump, to the drivers side of the engine. There was a plastic retainer clip on the firewall that was loose. During certain idle speeds, there was just enough pressure from the pump causing these lines to vibrate...

After placing it in drive (while hearing the noise), we brought the rpm’s up a bit. The noise goes away out of idle. They are still not sure what the cause is.

Great point. I told it into the dealer, since I am still within the warranty period. They mentioned the DPF bracket weld is not broken or loose. They are at a dead stop. I will bring this to their attention. Thank you and I’ll let you know what they find!

After finding other threads in the wrangler forums, I found a topic of the DPF weld breaking off the transmission. In turn, causing a knocking sound. You can see a link to a video. The noise I’m experiencing is not that loud, but sounds identical (but I can hear mine emitting from the dash...

I checked for anything in this area, and nothing. It almost sounds like this sound is radiating upwards from the transmission area. Again this is only at idle or very low speeds (>5MPH), only in Drive.

You can here the “flutter” sound each time I shift into D. Again, sound is coming from drivers side dash. Use link if you cannot see vide.

This is an automatic, and brake master cylinder.

I have an odd fluttering/flapping sound coming from the master cylinder/firewall region heard only from inside the cab. This sound is intermittent when in gear, at a stop/idle. It is sometimes subtle, and sometimes very apparent. At first I thought something was loose inside the dash, but this...