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AFR during/right after shift

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Have a Motec M150 on my 6 speed Supra and I notice slightly after my shifts maybe for .250-.500 seconds right when I shift and tps starts to ramp back up I get a very lean reading.I shift the car right at the limiter and I notice the injector PW seems to follow along just fine.Over run fuel is also disabled.Is this simply a small bit of lag with the wideband?

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