what RPM range? How sure are you that the shop did your tranny right? Do you have enough fluid? Perhaps the t/c is bad. If it really is slippage, I doubt that it would be anything electronic or vacuum related.
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WizAire CAI w/9" K&N & HV3, 2.5" d/p w/h/f cat, Cobra CB, PowerSlot slots w/Hawk HPS, GR-2s, GMPP handling kit, NextLevel STBs, Pilot Sport A/S Plus tires.
98 L36/MM5
RaC