Dock, did you wax the intake while you had the plenum off?

Well I'm glad to see this thread still here and still helping folks.

Actually if you have a reall good hydraulic shop in the area you can go and buy the o-rings for about .35 cents each. That is what I did once I found the right size and I keep a spare set in my shop.

Like Jeff said it is easy, you really cannot mess up and all they are is o-rings and not gaskets. Personally I would replace them all if it were me and I had it apart.

Good luck

Great post, I've learned a lot since I'm having the same issue on my 500efi, I'm also having surge issues, sounds like a 1071, can't imagine these issues are related,or are they?

Swap the 2 IACS...Heck, swap the throttle bodies complete.

Seems to me I had the same issue a few years ago so I'm a little fuzzy on the details, but I think I found I had low vacuum at idle & a large vacuum leak. The sucking sound may be air getting sucked past an almost completely closed IAC.