i just installed a new power booster and as soon as i finished i had almost no pedal it would sink almost all the way to the floor then come to a stop so i tried bleeding the brakes i got almost nothing out of the rears but the front were ok but while pumping the brakes to bleed them the pedal made a poping sound kind of loud(could hear it from outside the car) and now the pedal is pretty stiff almost like i have drums again and the pedal also makes a clicking noise when i push it any ideas to what could be causing all this?

The clicking noise could be from the switch for your brake lights that activates when you push the pedal. Mine did the same thing, a little WD-40 to clean up the plastic will take care of it.

Initially, sounds like you didn't bleed the brakes properly the first time. If the pedal is good and stiff now, you probably have it fixed. Bleed furthest from master cylinder first, then on down the line.

Popping noise - no idea.