My sports car with a 100hp/L boxer engine has a rough idle, Oh my God. I just can't belive it, what am I going to do, the sky is falling
Seriously until a see a hole in a piston I ain't worried about it. Just give it a little gas before the ECU takes over the idle control until Toyota fixes it.
Up/down/up/down (oscillation) at idle is a classic ECU/controls issue, probably went too far trying to meet a silly emmsions at idle regulation. Any EE's here that could explain what I am saying better?