Engine code said IACV.. so I replaced a new one. it seems better. but Idle still weird. WHen i'm driving.. reach the light and about to stop, shift to neutral, the rpm needle will drop, but it will drop down and raise back up to a certain point and stop. but in normal case, it will just drop down to the certain point and drop.

anybody know what else will cause that problem?

Thanks

i'm sorry to hear about that cause i have the same problem and that's what my friend told me it was when he did a full system scan on my car. The engine load was a little high to at idle. Here is a list of what it could be tb gasket,tps (voltage should be .5) intake manifold gasket, iacv, fitv, idle screw, vacuum leak. I've heard stories of pinhole leaks in vacuum lines and gaskets that have caused such problems. My suggestion is that you reset the battery take the car through 5 drive cycles and see what happens from there.

reset the battery? u mean reset the ecu right?

let me know.. and plus. how did u fix at the end?

was this ever fixed?