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Sounds like possible misfires or maybe the injector pulse width is way off. Honestly you need like an Aeroforce Gauge so you can check for Misfires. Data logging would be ideal but assuming you probably don't have HPTuners since you're using the ATI Canned tune.
:(
Have you considered getting a custom tune? I had issues with my canned tune so for me personally I say a custom tune is inevitable if you truly want to get the most out of your setup.
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