Ok, I wish I could change the name of this thread to "searching for solution to rough idle" because that's what the root problem has been. So a few weeks ago I finished all of the work on the fuel rail and I knew my injectors and seals were all good to go and I still had the rough idle. So I decided to pull off the throttle body and give it a thorough inspection and cleaning. I replaced the IAC seal, the lower bowl gasket, the main throttle body gasket, and a small o-ring on the plastic adjuster screw on the throttle body. This seemed to make the difference as my idle has finally smoothed out. Problem now is my idle is hunting up and down a few hundred RPM in park and neutral, and I had a loud hiss from a vacuum leak. I finally figured out that this hiss is coming from the adjuster screw because when I screw it in far enough and my idle drops, the hiss stops too. The o-ring I replaced was toast, hard as plastic, but I had no hiss before I tore it apart. The air passage was nearly clogged and that is cleaned up now. The o-ring is from Mitsu so not sure what the deal is. Oh and this adjuster screw has a rubber dust plug in the diagram that I have never had. Any ideas out there? Thanks.