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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?
Are you having any ignition and/or cuts occurring during the shift? An Ignition cut can give a false lean reading as the fuel is traveling through the engine without being combusted, leading to a oxygen rich exhaust as the lambda sensor reads the oxygen content of the exhaust.
Could it be tip in enrichment?