What accessories are you running? My Haltech driving 460 cc primaries used 2.03 ms duration to idle at -75 kPa MAP I had only the alternator and the air pump for the auxilliary ports (no PS, no A/C). This idle seems a bit rich to me, but you also have the stock timing map (horrible for power or mileage).
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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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