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You guys need to log afr, commanded afr , maf, manifold pressure, throttle , rpm , pprt amd direct injector pulse widths. Stft, ltft so you can see ehats going on.
High positive ltft at low rpm indicates intake or exhaust leaks, cracked header or similar
High negitive trims, often dirty maf sensor or oil on maf sensor
Afr cycling between very rich amd very lean like 11 to 15 fairly quickly at idle can be failed 02 sensor
But you need to log and confirm
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