Check for vacuum leaks.. And also you might want to try to reset your base idle..
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1991 GT with GT-40P heads, Polished typhoon upper and lower, E-cam, 1.6 rr's, Trick flow valve springs, BBK shorties, 70mm TB and EGR,70mm mass air, 190lph pump, BBK regulator (42psi) MSD wires and coil.
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