surging idle, am i on the right path?

Ok, the car is an 89 vert. 5 liter with a 5 speed.
Motor is fresh with approx 2500 miles. GT40 heads, e cam, 24lb injectors, explorer intake, bbk 65mm tb, c&l maf for the 24's, short tubes, no cats, no ac, no smog pump, no egr, no can purge. All the emission stuff was off when i bought the car. I built and installed the engine. Problems have shown up in the last month.
I started following the check list.
Pulled codes, got 41 and 91(along with the egr codes) showing lean.
Car stumbles when started(warm or cold)(some times) but seems to idle ok when cold, once it warms up the problems arise. i can run down the freeway all day, without a cel, it only shows up in traffic.
from reading the checklist, its possible i need an iac, but i could clean it first. but, without getting my AFR's read, is it possible that at 105K on the car it needs both 02 sensors?

Anyways, i have stopped at this point, looking for a little advice before i go buy parts.
when the rough idle starts it will bounce from like 400-1200 a few times and die, i can stab the throttle and keeping it running, and sometimes after a quick stab it will settle down and run fine for a while.

i've gone through the thread, and got to the point of pulling codes, but the only thing i got was lean. but my idle symptoms fit the that. i'll play with the maf and then go from there.

the idle issues seems to have cleared up quite a bit, however my father thinks lean on both banks is a vacuum issue... oh the joy

does it sound normal that with my MAF at certain "clocked position" i lose a ton of power, but regain it with a slight turn of the maf?

well, i got to thinking, its throwing EGR codes due to not having one, won't that cause it to go lean(the car leaning itself out to accommodate the EGR, when its not there?)