alright i have a b18b in my eg, and when i start it up the idle shoots up to 4500rpm and holds it for a bit. then it will start to surge for atleast 10 min utes and will eventualy go down to normal, but it will surge a couple hundred rpms, please someone help me with this.

 

Possible vacume problem? or maybe a bad iac valve, or throttle position sensor?

 

put a new iac from a single cam motor, and nothing changed, cant see any visible vacum leaks.