From cold start car idles fine at 1200/1500 rpm. Once I start driving that's when my idle drops to high 8's low 1000's. its not steady. it goes up and down between those idles constantly. Then stays at mid 8's after awhile.

Cause anyone?
Thanks.

 

Right now I am having a similar problem. I would go to a couple pages back to see if you are having the same issue? Do you have s trouble code coming up?
many people find to have problems with their egr solenoid or valve being dirty.