I just put a b18b1 in my EG about a month ago and I have have some problems with occasional ranging and hesitation. But now it has gotten horrible my car will die at idle and will hesitate unless I give it full throttle. If I try to keep a sustained speed it just breaks up until I floor it again. It is doing this all the time now. I have tried a few things so let me know if there is anything else I should check or re-check

Items replaced:
For the ignition;
cap, rotor, wires, plugs
Fuel;
filter, system cleaner, and cleaned injectors by hand. Also replaced 02 sensor
Vacume and sensors;
Checked for missing vacume lines, cleaned IACV, check all plugs to sensors for a snug fit
Checked with timing gun, its all good and no CEL lights

I am going use some carb cleaner tonight to see if there are any vacume leaks. This is getting to be extremely annoying any help is greatly appreciated.