car leans out at 1500rpms,,

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ok, just as the title says... whether its wot, or just partial throttle,,, especially when the car is cold there is a flat lean spot between 1500 and 2000rpms, on the wideband it reads like 19:1 a/f. but through the rest of partial throttle is like 13:1 or so i think(cant remember, just know its safe) and then wot is around between 10.7:1 to 11.2:1.

my mods are:
3" gm maf
maf translator
fmic w/short route
walboro 255hp (not re-wired yet)
680 injectors
bolt on 50trim
also, car is stock auto

anyone have any ideas why it goes so lean at so low rpm? it sux esp when trying to pull out into traffic and sometimes the car just wont move,,, almost been hit a few times... also think this is why my car wont stall above 2200rpms? thing is, it doesnt bog all the time,,, so i'm lost...

 

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no one knows??