The idle screw is on the BAC (I wish I could get you a picture, but I no longer have any stock TII engines laying around).
It is on the passengers side, right below the intercooler.
I would guess that your issue is a mal-adjusted or sticking fast-idle cam (supposed to release when the coolant gets warm).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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