I have a manual 2000 Honda civic d16y7 with 200 000 km on it. I have this weird idle issue that only happens in stop and go traffic, while driving in stop and go traffic for about 15-20 min my car start idling at like 1500 rpm then 3-5 min later at 2000 rpm then 3-5 min later at 2500 and it just keeps getting higher and higher, then after I get out of traffic and drive for about 3-5 min in 4th gear and come to a stop my idle is back to normal.

 

Inspect your car for any vacuum leaks... and/or lose or disconnected vacuum lines. If everything checks out, clean your IACV.

 

What should I use to clean out my iacv?

 

Here's a good run down on what you will need and how to do it.

https://honda-tech.com/forums/acura-integra-6/%2A%2A%2Ahow-clean%2A%2A%2A-your-iacv-k-idle-air-control-valve-1575913/

 

Clean the throttle body and adjust the throttle cable to have some slack/free play.

 

i already cleaned the throttle body and cleaned the IAT sensor about 2 months about and it didn't help, I also check the slack on the throttle cable and its good.

 

thank you

 

Sure sounds like the throttle plate is sticking open. You might want to try cleaning it again.

What CEL codes?

 

No codes but it only happens while im in stop and go traffic for like 20 min