Ok wait. To much information to process.
My 08 has this fluctuation/stall at low throttle that I don't know how to get rid of. It only happens when I tap/step on the throttle a little. It's fine in WOT.
I've heard different tings it can be
-Vacuum leak, (probably not it)
-Fuel pump O-ring.
-etc
Is this what you are talking about? I'm looking for a fix for my car too.