Tacho drops to 500rpm

[steebs]

didnt want to start a new thread, but has anyone got a fix for this prob ?

i've got exactlly the same problem cept in a dc5r,
was gonna try cleaning the IACV but noticed a gasket between the IM and TB, didnt want to try just yet until i have a spare gasket just incase.

heres a link i found handy
http://forums.clubrsx.com/showthread.php?t=288936

also to add more info,
went for a drive around the block,
got back into driveway and thought i'd run a few test,..

car is in neutral
- air con on (doesnt matter what setting) -> revs drop to 500 then back up to 700
- lock/unlock doors -> revs drop to 500 then back up to 700

could it be a bad ground by any chance?
or could anything else cause these issues?

i am throwing a CEL but i suspect thats due to headers+high flow cat

cheers,
steven

[DR HONDA]

Disconnect the battery or remove the pcm back up fuse for one minute then let it idle for at least an hour to learn all adaptive values. This may help if there are no engine management issues to relearn all adaptive values and idle.

[[ricer]]

let it idle for at least an hour

just idle in the drive way for an hour?

no driving what so ever or anything?