Check O2s. Maybe just replace them. Supposibly they should be replaced every 50 to 60000. Not sure if that is needed but nearing 100000 it may be time.
Green 2000 SVT #1166
mods-K&N open air filter & Custom heat shield, Custom y pipe and 30 in resonator,DMD, arm rest heightened
http://www.geocities.com/savinoss/Cars.html other cars-89 sable 197000 miles and still going-Wifes car 99 Mystique V6 5 spd
