1996 Honda Prelude My car keeps cutting out after I start I

Every time I let my car sit for bout an hr or so, I will go to start it, It will start fine and go to idle then it will start to miss fire real bad and when I go to take off it will cut out on me until I hit high rpms. It has not died.
So far I have changed the fuel filter, spark plugs and wires, coil, injectors, Also when I changed the injectors it had real bad carbon build up on the old ones and in there holes I tryed to clean them the best I could.
It seems as if the car was not getting enough air and or fuel. I do have a aftermarket exhaust on it and one of the o2's is not working. I also have the racing plug wires 8mm. Can you help me please I have been at the same problem for months now.