The only other thing I can think of is something in the intake. Check one of those innocuous looking black boxes that leads to the vacuum lines and see if those are still in one piece. They have a tendency of cracking open. Not sure what else could be wrong especially since the issue should be post MAF not in front of it.
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35% Hooper Optik | Takeda Attack CAI | F.I. HFC | Hotchkis Sway Bar | Stillen 24row | OS Giken Super Lock LSD | TK Shift Knob | EVO-R Carbon Diffuser
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