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Those compression numbers are fine (s5s will start at 60 psi and idle fine).
I don't think is it a mechanical problem.
Is your AFM mounted level?
Has someone tampered with the idle mixture adjust screw on the passengers side shock tower?
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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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