With A/T idle rpmīs and mixture screws needs to be adjusted in "D".
What carb and how many turns out from lightly seated are the idle mixture screws?
Is the carb idle/lowspeed circuit adjusted/modified for todays fuels?
HTH
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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