Scottsi

my car idles fine when i start it, then i drive it and put it in boost and it idles like it has a vacuum leak, and i turn it off then back on and it doesnt have a vacuum leak anymore, wtf is causing this? i already checked for vacuum leaks 3 times, sealed up EVERY last hole on the intake manifold, triple checked everything im pretty damn sure it isnt a vacuum leak. what could it be? my iacv?