My r has recently started idling at 1500 rpm, even after warmed up, i'd adjust the idle but before I tried i noticed at a light if I gave it a minute it would drop back to 700 after about 10 seconds, is something sticking, and no the throttle cable isn't too tight.

 

Just developed the same prob...and I don't know why yet...any ideas?

 

my guess is that is related to the IAC. check your coolant level, then clean the screen on the iac.

 

Could it be computer related, I put in a hondata and it didn't run so I had to send it back to get reprogramed, then i stuck the old computer back in, I thought amybe it was relearning but its been 2 weeks!

 

after i put in the skunk computer, the idle began to bounce from about 800-1500rpms consistently. It has been almost 5 months, and it still is doing it. I guess it doesn't bother me anymore, i just got used to it...

 

seems to be a common problem when you modify Honda b-series engines, the idle is never the same as stock. I noticed that mods that lighten the rotating assembly make the car idle higher, such as crank pullies, lightened flys, etc.... . I think the IAC eventually is able to get the rpms down but it takes a few seconds after going to a stop. My car does exactly the same thing. My over-bored throttle body may be leading to that also.