i did that too when i first swapped because the h22 injectors that came with the motor were shot. i always got O2 codes and then the car would run like shit. once i got h22 injectors for it, there was a huge difference.
do the math
h23a1 = 240cc per injector
h22a/1 = 345cc per injector

i got mine on ebay for $60 and sent em to RC engineering to be cleaned for $25 each.

~kris