Hi,

When I startup my 2004 Toyota Camry, especially when the engine is
cold, it goes up to 2200 rpm for some 10 seconds. Then it goes to
1600-1400. After a few minutes of driving, it seems to idle at 700-800
rpm or so, but even slight acceleration is always at 1500-1800.

High idle rpm is always slightly different, and it seems to be
computer-controlled: all the rpms seem to be multiples of 100 or even
200 (i.e. is goes sharply from 2200 to 1800, then to 1600 after a
minute, without gradual decrease). Idling for a few minutes doesn't
heat it through: it only goes to the 800rpm after a few minutes of
actual driving, not idling.

Does anyone else have similar effects? Is it normal? I suspect that the
engine computer(s) does it, but going up to 2200 rpm seems excessive to
me.

Any suggestions? Is it a problem to be concerned with?

Thanks,
Sergiy