Yeah. It's the Autolites you put in there. They're crap in the 2UZFE. Get them out and replace with the appropriate Denso or NGK plugs. FWIW, I like the NGK #BKR6EIX Iridiums. Don't forget to use a small dab of anti-seize on the threads.I just changed the oil and filter along with the plugs on my 2004 Tundra V8. Went for a test drive and it hesitates when under acceleration and the check engine flasthed a few times but then went off. Any ideas? The new plugs are Autolite.