Car Idle at 2000rpm Help Hurry

[manycars23]

I bought a 70mm throttle body for my 94 GT I took the old one off and installed the new one put everything back together but when I started the car it idled at 2000rpm I tried adjusting the idle screw on the TB but nothing worked. So i was pretty p.o.'ed
so i put the old Tb back on and the car did the same thing. Also there is a little more play in the throttle cable than there was when I started. I checked it at the pedal and the pedal doesn't jump back up like it used to however you can wrap the cable around a piece of the Tb and the pedal is in normal position and it revs fine but still only comes down to 2000rpm. Does anyone have any advice for me or help they can give I am in dire need because if i drive the car like this it will peel out of 2nd gear and just generally not drive right obviously!