Doubt its the tune, they don't just go "out of tune". May be fuel if you've filled up recently. Your Matty's mate aye. Bring it in to Wangara and we can plug the comp in and check the code.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i