Just got a question about this, Im driving around in my brothers Camry today which has the 1MZ-FE with a manual gearbox.
First question is it idles its head off at about 1800rpm when its cold, and then drops back to about 750rpm once the operating temp gets up.
Secondly, it seems to hold the rpm for about 2-4 seconds before backing off. For example, your accelerating along, back off the accelerator and it maintains the rpm's for 2-4 seconds before dropping off.
Its a pain in the arse, especially when your driving in traffic.