You might try buying a coil pack and substituting it one by one through all the cylinders and see if that helps. It may be misfiring but not enough to throw a code. Not a bad thing to have as a spare anyway, at least with a 2UZ-FE...
"Stay the Trail," "Tread Lightly," and "Leave No Trace" ethics
Rising Sun Bio
2F "Brahma" + Lockright, tach, Warn 8274, FJ60 Power Steering,
soon to lose the Sanden OBA
to go back to factory emissions
Limited TRD 2UZ-FE FOR SALE SOON
Up next: Something that makes a funny whistling noise...