Here we go... odd sound

[X5Andrew]

Ok I know this is the hardest thing to ry and figure out, but I'm taking a shot that this is a common one. Have a sound only when driving that sounds like a plastic bag is stuck somewhere under the truck. If I had to guess, left front. No loss of power and no codes. all fluids good. Sound in creases in rapidness (if that's a word lol) under acceleration. Now here is the odd part. It isn't always there. Doesn't seem to matter cold start or warm, just very random.


Best guesses ?

And yes, to reiterate, I know sounds are the worst to diagnose without hearing it.