I had a similar issue that I fixed not too long ago. Turns out I had a vacuum leak post MAF sensor because one of the cheap plastic pieces on the post MAF tube had snapped and was now just sucking in air from the engine compartment. I would check all the lines coming out of the intake just to make sure that wasn't the issue. I thought it was a bad tune as well but now my car's 100% again.
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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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