I low there is a sticky about this. I've read it 10 times. I've looked over everything. My idle still has the womp womps. Can anyone give a hint or has anyone had this problem constantly. It loud. It's annoying. An people think I keep trying to race them or revvin at them. I have a ls swap in an eg hatch, if that helps any. Thanks

 

womp womps meaning your idle is going up and down? i'm assuming you've already gone over your entire engine bay with a fine tooth comb looking for this vacuum leak (which is my assumption the problem is)?

 

I hope your not being a smart ***. I'm looking for serious help. Like I've said I've done everything. The only thing I haven't done was a smoke test.

 

What year is the LS motor, does it have a coolant port at the throttle body? In actual fact...not being funny...is your womp womp a fluctuating/hunting idle??

 

Most likely IAVC
Or coolant level / coolant level sensor

 

internal or external vacuum leak.

a few likely potential causes:
FITV too far open
cracked vacuum lines/leaking gaskets/open vacuum ports
IACV dirty or sticking
Idle set/air mix screw out of OEM spec


I would lean towards FITV if no vacuum leaks were found.

 

try the good ol wd40 bubble test