you might be on to something. i talked to a friend oif mine that worked for a NISSAN DEALER CLOSE BY. and he was their top troubleshooter. he told me the O2 sensors would just make the computer run in close loop and take care of it until it was fixed but it should still run fairly good. he said it had to be something else causing it to loose power and want hardly run. so i may give yours a try cant hurtAlso to go along with 88's suggestion. Disconnect the battery for a little while in case the truck went into limp mode.