I had the same idle problem on my zc so I replaced all the vacuum lines, which had never been replaced anyways, cleaned the evac and the problem went away.

 

Well mine sat at a shop for 3 weeks, and that guy drove hiself crazy trying to figure it out. needless to say the idle is still fucked.

so far ive done.
all vacumme lines checked
brand new iacv from honda (didnt work took that bitch back lol)
tb gasket

the guy told me he thought it was my intake, which didnt sound right at all, but ---- it imma give it a shot if I can ever find a cheap stock intake. and as soon as i find a uberdata tuner locally that bitch is getting done for good.

 

here is a good write up that solved my problems..

http://www.honda-tech.com/zerothread?id=1003988

 

i had this problem with my obd1 converted 96 civic. never figured it out. seriously checked everything even replaced my iacv. i think its jsut a side effect of converting obd's

 

mine was the FITV. its on the bottom of the throttle bod. takes less than 10 minutes to fix... just take off the plate and screw the white round thing all the way in. should look like a small button in the middle. and the white ring has 2 little indents on it, perfect for use of screwdriver lol.

 

Ghetto leak test= raid bomb and a respirator

 

dunno whats the problem with my eg3 dx 1.3 single carb

when u crank the motor it revs to 4.5k rpm and sits there for a couple of minutes then it goes back down to 1.5k rpm

or u move off and speed up to 20mph+ revs drop back to normal

when u press down the clutch the revs drop below 1k rpm and stalls when u stop

some one plz help me

 

my intake hums really loud.. that means my iacv is bad? cause it idles fine as long as im using a obd2 ecu..

 

What intake manifold is on the car?

 

Mine hums real bad too, just a SR intake on a VX intake/motor. (it's real loud though, sounds like someone is humming really loud with the hood open) I'm betting 240k miles killed my IACV. I think I'll take it off and try to clean it out so I dont stall when I stop.