Yep sounds like a vac leak. I recently had one, it was on that little rubber elbow just below the throttlebody, damn part cost me $24 since its a dealer item only. I'd take a close look at all of your vac. lines. Simple way to check is with the motor running spray some throttlebody cleaner on them, if the idle gets rough when you spray you've found the leak.
Whaddya mean I dont pay my bills?? Whydya think I'm broke!!
03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]