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Shame you aren't using a OBD-II PCM. My computer is in a box with a tune for a CC306 6spd which I could lend to see if that would make any difference. I think your issue may be the tune but PCM4Less has done those before so I would imagine they are using default values. As mentioned, start data logging and report back. No need to drill a hole in the TB.
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97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
'17 Sierra 2500HD Dmax
'17 Lex LS460
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