SLPExhauster2004

I have an 04 mustang gt with 20,000 miles on it and I put a accufab throttle body and plenum and bbk cold air intake on my car. After I installed it The idle bounces up when I push the clutch in and when i take my foot off the pedal the car is still giving it gas for about 4 seconds then the rpms drop from 2 to 1 grand. I have the t.p.s set at 98.5 voltz and when I unplug the I.A.C the car runs right then i plug it back in and its back to running horrible. All hoses and plugs are put together right. I cleaned the i.a.c and nothing helped. Any help much appreciated.