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Makes sense since the car has a lot of pickup and power it just acts like it runs lean
Yep, a small vacuum leak will generally affect the idle more than higher RPM's. They may have diagnosed it by looking at your A/F-alpha (STFT on most generic scanners). Small vacuum leaks will always cause a rich STFT that goes away above about 2000 RPM's. It's a dead giveaway. Usually unmetered air won't cause a rough idle, but the plenum gasket is an exception. A leak there will generally affect the cylinder right beneath the leak more than it affects the others, causing what may feel like an intermittent miss.
 
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