Originally Posted by lexusrolex

so I'm having sort of the same problem with my ls400, the idle goes down almost to the zero when i come to a stop, and it comes back up, iv been trying to figure out why it does that, the check engine light was was on, so i checked what it was, the code was for my egr valve, so i got a new one, i put it on and it still acted the same way, so i asked some one on the forum, and they said to clean my throttle body, so i did, i was so dirty i even took off the top intake manifold and cleaned it with carburetor cleaner, so i put everything back and it still acted the same way, so, some one else said, it was going to be my idle air control valve, so i replaced it!, i drove around and the problem is still there, now i don't knw what it cud be, i need some help