Too low RPM randomly when Idle

[hani1400]

My RPM goes below 500 when idle randomly, it vibrates and it doesn't feel normal.

I don't get the check engine light, do you think maybe it's one of the sensors (maybe the oxygen and fuel mix sensor) and do you think i will get codes without the check engine light on?

What do you think the cause of this would be if it's not the sensors?

 

[toytech76]

Could be a dirty MAF, bad idle air control valve or even a dirty throttle body

 

[hani1400]

I seafoamed a couple of months ago and i will do it soon again,
is there any guide for how to clean the MAF?

 

[4X4snowRunner]

MAF cleaning

I seafoamed a couple of months ago and i will do it soon again,
is there any guide for how to clean the MAF?

Here is how to: http://www.toyota-4runner.org/showthread.php?s=&threadid=36674