I would do what everyone else is suggesting. MAF, TB cleaning maybe a spark plug change if you have not done so recently. ( or if the car is new that's probably not your problem). Vacuum leak is also a suspect, if your familiar with a scan tool you can hook one up and look at your short term fuel trims for both bank 1 and 2. I believe if it's a positive number that means your engine is running lean(intake leak, also if this number isn't greater than 10-15% then you don't have a intake leak). Negative means it's running rich. A good way to test for a vacuum leak is to observe these numbers at idle, and then rev the engine to roughly 2k-2.5k rpm. If the number decreases back down to zero then you have a intake leak somewhere. i would look up a video because what I just explained can be confusing for someone whose never done it before plus I'm just explaining how to do it off of my memory so some of my info may not be 100%.
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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.
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