Low idle, misfires at low rpm

[It's Just Eric]

Well, I figure now is as good a time as any to re-hash an old issue which, as far as i can tell, hasn't had a proper resolution.
my car, as the title indicates, has a low idle, and runs quite rough at low rpm. The car seems like it has a miss up till about 2500-3000 rpm, then suddenly realizes it has all it's horses and jumps into action. As far as i can tell, it operates perfectly in the higher rpm range (however, it HAS been quite a while since i've had a properly working svx, so my standards of what's right or not could be skewed)
The problem seems to mostly be when it's cold...but it will do it at operating temperature occasionally as well. Also, when i get gas, the tank is pressurized and hisses as me, which may or may not be related to the problem. Also, i get the dip stick pop up, which makes me think the pvc is stuck, but if i remember correctly, i replaced that about a year ago. In any case, the only check engine codes i've gotten are for the o2 sensors, which have been bad since the dawn of time, and the egr, which i removed.

trying to find the issue at hand, i've replaced the cam sensors, crank sensors, all the coils, the maf, the tps, the ignitor on the firewall, the engine and under manifold wiring harnesses,the ground strap from the trans to the firewall, used dielectric grease on every plug, replaced the fuel filter, rails, injectors, fuel pressure regulator, used fuel injector and water drying solutions in the gas, changed all the vacume lines under the manifold,replaced the ecu, checked the timing, and replaced the spark plugs. No changes.

I happened upon this thread trying to figure out what else to look for, and it seems this guy had similar issues, but after reading 8 pages into it, the thread dead ends http://www.subaru-svx.net/forum/show...light=low+idle I also suspected removing the egr could be causing detonation, but the thread i started on the subject also got nowhere. I know people have removed egr systems without concequence before, so this might not be it either.

Needless to say, i'm at wit's end here