I have the buzz / rattle periodically when I cold-start my vehicle. It sounds as if there is a loose baffle in the catalytic converter or muffler, but I cannot tell which one. The annoying sound is extremely embarrassing; however, it terminates when the vehicle warms. Anybody else suffer something similar??? I do not believe it is the transmission, because I do not feel any clunks or lag.

Insights are greatly appreciated, and I apologize if this has been posted before.

I found the TSB. Sorry.