Impossible to find vacuum Leak gm 3.1/High idle

[i6pwr]

What vehicle is this in? Year?

Does it have an accelerator cable and cruise control cable?

Likely not an issue but not sure what vehicle we are working on.

 

[snarl]

What makes you think it is a vacuum leak?

 

[Junk]

What vehicle is this in? Year?

Does it have an accelerator cable and cruise control cable?

This was honestly my first thought. Usually vacuum leaks that are bad enough and engine idles high are 1) pretty easy to find, and 2) will definitely show up on a scan tool in the form of lean fuel trim, or in the case of gm pre-96 cars skewed block learn values.