Ac has loud humming at idle but goes away when I give it gas

Dustin, could be a few things, failing alternator bearing, belt tensioner, Belt it self, water pump,etc. Take to a good technician and have them diagnose and estimate repair.
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is it a metallic sound? could be alternator bearings...otherwise look for vacuum leaks.

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Misalignment of the belt, incorrect belt, worn or loose tensioner, Too tight of an adjustment (many service centers do this on purpose so when the belt breaks in it becomes properly adjusted, I do not believe in this philosophy), The belt is actually one long belt called a serpentine belt.....

replace the idle air control (IAC)

Hello! If the humming noise is speed related(gets louder as vehicle speed increases)check front wheel bearings. If the noise goes away when turning one way or the other then it will most likely be in the front wheel bearing. If you turn the wheel(while moving)to the right and the noise goes away it is on the right side. If you turn the wheel to the left and the noise goes away its on the left side. Hope this information helps!

yes check the idle speed sensor also the map sensor

could be the belt tensioner,

Sounds like a vacuum leak. Check that all your vacuum lines are attached and in good condition.