Dirty idle air bypass valve maybe? Do you have mods - a cam maybe? I was having so many problems with my idle that I just used the throttle screw to set the idle about 900 rpm, egged out the TPS screw holes so I could set the TPS reading to .95 volts and haven't had any surging idle problems since.
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93 GT, CCM long block, GT40P heads, Crane 2031, 1.7 RR's, Moroso cold air, 73mm Vortech, 65mm TB, Cobra intake, 24# injectors, MSD 6AL, MAC GT40P headers, 2-1/2" BBK H-pipe (w/cats), Flowmasters, 3.55s, B&M Ripper shifter, Black Magic fan, Groundpounder LCA's, Comp subs
13.817@102.45 - 1/4
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