Idle Stability/Vacuum WTF????, Little insight here please Options

[bsamps4]

]Check out this video. My idle bumps just like the vacuum between 550-700rpms. It does this after the car has fully warmed up. Cold start the vacuum and idle hold firm until the engine gets up to operational temperature.

Things I\'ve done:
full boost leak test, and repaired the leaks I found.
smoke test, and repaired the leaks I found.

My question?....what else could cause this? Sticking IACV maybe????

oh yea...it\'s a 3rd gen 3sgte. Fully built...etc...most of you are probably familiar with my build. If not it\'s in the my project section.

http://s1190.beta.photobucket.com/user/bsa...403873.mp4.html





This post has been edited by bsamps4: Nov 12, 2012 - 7:18 PM

[delusionz]

thats not an idle adjustment screw, thats a throttle return stop

as for the shaking - do you have polyurethane engine mounts?

the IAC is 3 wire, meaning 2 coil (power one side=closed, power other side=open, no power = not swayed either way) so its always in search of the correct idle speed, that **** pulses like a mofo - so it must be clean and free to move to be capable of good idle

and when setting your ignition timing, it has to be in diagnostic mode so the ECU doesn't interfere