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Unfortunately, The BAC valve is not likely your problem... I am guessing that there is a wire crossed somewhere to the BAC. The BAC should be pulling air in through the AFM anyway, so it shouldn't be a vacuum leak.
The BAC is a solenoid and will operate when it gets voltage. I think yours is working just fine, but getting a signal when it shouldn't.
If you want to test it, apply 12 volts to it to verify that it opens (take it off the manifold and watch the plunger). If it opens when energized and closes when de-energized, it is working properly.
Your timing sounds just fine (I think negative indicates ATDC which is the factory spec).
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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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