I need help my car revs up and down at idle i think it might be a vacuum leak but really not sure cant find the problem...any suggestions would be great help thanx

 

iac valve also a valve on the front of the intake on the driver side have a cover on top with 2 screws open it and screw down the plastic cover in side use a screw driver on the outer edge were the slots are then back it off a hair or a vac leak but not often