Q: Brake Booster

So I cleaned my throttle body because my RPMs were fluctuating like crazy, especially while idling in park. Cleaned it with carb cleaner and that fixed a multitude of other problems I was having as well. Truck runs great, aside from a connector breaking leading from the throttle body to god knows where, but I replaced the hose connector. Bad news, the stiffness in my brake pedal has changed. I am able to pump my brakes and get the brake pedal firm while the truck is shut off, but when I turn it on the pedal sinks to a set spot (does not continue sinking) and I can vividly hear the air as I try to pump the brakes. I drove it around and am able to stop, but am worried if I have to stop suddenly I wont be able to respond as quick as I should. Keep in mind, I did not have this issue prior to cleaning the throttle body.

My car has 185000 miles.
My car has an automatic transmission.