kennyo

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

Dock Holiday

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

BYFS

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?

dereknkathy

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

ctuck0659

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.