Search your service manual for TRD torque reduction request.
During the shift, the TCM requests that the PCM retard the timing and shut down the fuel injectors.
Torque managment isn't new. GM and Mopar have been using it for several years. Cadillac has it as far back as 1994.
I designed a bypass for this annoying problem for the 2001-2002 PTs. The 2003 & newer use a different PCM and my mod circuit has been deleted.
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