2006 FD1 Civic Idle problem

[zelar]

2006 FD1 Civic R18 MT

Recently I got a flat battery.
After i recharged, now every time i rav the engine, the rpm will drop down to around 850, then the engine ravs up to around 1500 rpm by itself, then drop down to 850 and stays there. Also if i put in to neutral and let the car roll, the idle will stays at around 1500 and drop down to around 850 when the car stop.

http://www.youtube.com/watch?v=XvzrQoE1v08
This is an Auto, but my car doing the same thing.

Checked all systems wilt scan tool, no DTC. No warning light is on.
Also done the idle speed relearn, didnt help.

Anyone knows what I need to do to fix it? Help! Help!

[JOhnnyFD]

how long did u recharge the battery for??

i was gone for 3 months.. battery died and i just replaced it like 8 months ago so its still a new batt... recharged the battery for a whole day.. cars running good. no idle probs

if tat doesnt work or u did recharge the battery for a day, disconnect ur battery for around 15mins then reconnect, tat should reset the ecu.. see how that goes

[DC5.Raven]

Could be an IACV issue. Read below:

http://www.ozhonda.com/forum/showthread.php?4693-IACV-clean-check-!&highlight=Intake+idle+control+valve