so ive been noticing my car not really running right for a while, and since i had to put my cats back on a couple weeks ago for inspection, i decided when i put my o/r h-pipe back on i would dig into things, and now i just want to make sure of things that i think i know the answers to. i tend to over think things sometimes, so i want to check myself and maybe dumb this down some. i was getting a 41/91 as my only codes before, and while redoing my exhaust, i did the following: new fuel filter cleaned/flushed injectors (used 24's, and one was clogged up pretty good) new plugs and wires swapped my kirban fpr for a stock-replacement i had laying around new 02's (i had checked voltages about a month before and they didnt seem to fluctuate like they should) new pcv and filter (the filter was missing before, dunno how that happened, but no more oil in the upper intake now) air pump delete after doing all that (and cleaning the injectors a second time cause i was still getting a 41 but not a 91), and reseting the idle and tps (which the one i had apparently took a crap, so new one of those), it runs waaaay better, but now i got different codes: 12, 44, and 94 (the 41/91 are gone, which is what i was really trying to fix). the last two i guess are because the air pump is gone, which is odd since i used to get those when i routed the air pump directly to the cats a couple years ago, but i didnt get them with the 41/91 showing up, so im guessing the lean codes covered up the 94/44? the 12 i still gotta mess with, i know its iac related and its probably clogged up somewhere. the thing whistles like a sob when its unplugged, and there is a slight idle surge (and it whistles when it closes and the idle drops), so ill take it off tomorrow and see if i cant clean it out, not too worried with this one, been down this path before. the last "problem" i have is with the fpr, the stock replacement i had sitting around would be at about 40psi with vacuum at idle, but without the vac it would shoot up to 50(!). i just put a brand new one on it, and its 40 with vac and 45 without. i know its supposed to be in the 38-40 range unplugged, so is this one fubar too, or do i have something else going on? i had my kirban adjusted right (~39 vac off, i forget what it was when vac was on), the only real reason i swapped it is because it makes slight contact with the egr valve even with a 3/8's intake spacer, doesnt keep things from sealing up, but i figured while i was in there i would make things simpler. i guess ill just put the kirban back on? other than the slight idle surge, which i think is an iac problem, it seems to run fine?