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...
Rising Sun Bio
2F "Brahma" + Lockright, tach, Warn 8274, FJ60 Power Steering,
no more Sanden OBA
1FZ-FE factory lockers +
Safari intercooled turbo, CDL switch, cup holder, Metric TLC leather, heated seats, JDM switches, PUMA OBA.
Warn M12000 waiting for a bumper.
Limited TRD 2UZ-FE SOLD