i have a 93 sc with 250000 miles on it, it is fast when just staterd up but after a while it loses power, could it be bad o2 sensors making it run lean?
same here. i just replaced mine and man does it feel like a different car. a lot smoother, especially while idling. if you have bad sensors, your mixture is going to be off during part throttle operation and it might reduce the amount of power you make. however, during wot, i believe input from the 02 sensors is ignored. i think the computer has preset values to go by. dont know how much power you'd loose from bad ones though.