I had the same problem on my '91 and to solve the problem, I adjusted the dashpot outside the factory specs (tightened it in further). If you go too far, the throttle will be held open (not desirable).
You should also look into your ignition timing.
Did you just get the 'vert together with boost, or have you had it for a while?
I have a good friend (not on here) with a turbo 'vert, they are cool.
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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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