hey guys, i have this weird poping noise that i can hear coming from around the passenger side footwell. it happens randomly and will make the sound for a few minuits. it sounds like something is almost rubbing, or bouncing. i did notice that it happens when the car is also at a stop, and the key is in the "run" position. i can turn the car off or in the "acc" mode and not hear anthing, but when i turn it to "run" or "start" the noise will start back up.

has this happened to anyone before?
any help on what this could be is greatly appreciated.

thanks, Nick