"Beetle" sound coming from around throttle body

[CMG]

Ok, you know the sound a vw bug makes, that twittering kind of sound. I have a similar type of sound coming from my throttle body when I let off the throttle. I've checked for vacuum leaks, and the bottom nipple on the tb is plugged. Only thing I can possibly think of is that I need to adjust the throttle cable? Does not seem to affect performance, runs and idles like a champ.

[seanman]

if your cable is loose it might vibrate hella weird like that. check your slack.

[CMG]

It has no slack, I was thinking maybe it is too tight and keeping it open just a millimeter or something. It's not vibration, it's more of an air sound, not metallic sounding at all.

[James@CI]

At idle what is the rpm at.

[CMG]

When cold starts up to around 1600 rpm, settles to around 800. Don't quote me on that, I'd have to double check, but it idles fine.