My 97 did the same thing...dealer replaced for $500...so ur geting a deal
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1997 Dark Teal Green SE 3.8
Mods: Thrasher CAI w/ Relocated IAT Sensor, STB's, 180-Tstat, RT High flow CAT, SLP Loudmouth Exhaust, DHP PCM, MSD Coils,GM Tranny Cooler, Painted calipers w/ Grandprix decals,MSD Coils,PIAA superwhite headlights and Superwhite fogs,clear corners, and a whole lotta bass....