I'm not too savvy with tuning, but your tuner should be able to make some adjustments that can potentially fix this. I still also say check your exhaust for leaks. I've had a GTM SC kit since 2011 and have encountered some exhaust leaks that have caused similar issues.
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Eibach, Tanabe, Blitz, Vertini, GTM stage 1.5 SC, Aquamist, Invidia, Alto built 5AT, Edge Racing, Racelogic, GTM driveshaft, 440 whp in 101F TX heat..
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