I have a 1999 civic Si with a b16a I have a idle issue when it warms up it wants to fluxuate up and down at idle between 1000 rpms and 1600 rpms just up and down ,, the only thing that is tripping me out is there is No SES light PLease if you know what this may be HELP ME

 

check for vacuum leaks.

 

I have seen No vacuum leaks I am very concerned the only time this Idling issue occurs is when the engine warms up and I drive down the road then come to a stop the car idle goes up and down constantly please does anyone have anymore suggestions

 

check your fast idle valve probably needs cleaning.thats what happened in my case.