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I'm guessing tune too. Possibly getting some detonation. Had the same problem with a subaru when I moved to Las Vegas. The car was tuned in Florida for 94 octane. In Vegas, it was hotter, dryer, air was thinner (higher altitude) and they only had 91 octane. The engine under load was making a lot of popping and pinging noises (and didn't throw any codes). I got a better tune that allowed for the new environment and it cleared the issue up.
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