Originally Posted by SeVeReDiStOrTiOn
Sounds like you're getting unmetered air into the manifold from somewhere. Check your throttle body and make sure it's torqued to spec. It could have been loose and when you put the stock intake on the jarring caused a vacuum leak. While you're in that area check all the vacuum lines you might have knocked one loose.
I agree. I've been a hobby mechanic for many years, I've never once experienced a stock CAI draw more air than an aftermarket, so I'd guess vacuum leak somewhere. Take a can of throttle body/carb cleaner and spray around vacuum lines/intake manifold. If there's a leak, you'll find it.