fordguy8867

the guy i bought my truck from had the 2 catalytic converters cut off only on the drivers side, with a straight pipe replacing it. it ran really rich and had to run premium in it, but still ran pretty good until i had to replace the computer, which was probably because it couldn't adjust to the cats being off. so i went and replaced the catalytic converters and oxygen sensors on that side. it runs good until i really get on it. it would shift fine and accelerate and then it would bog down with rpms still increasing. i took it to the shop and they watched all the o2 sensors and the one on the drivers side after the cats was falling and causing the truck to run lean. all the others on the graph were moving up in down indicating they are working except that one. these are brand new oxygen sensors could it be i got a bad on or is there something else it could be? please help me out