[scottfab]

uh, before you yank out the plenum or engine make two quick checks.
Does the idle come down if you punch the throttle hard a few times?
If so..

1. take off the bellows and then get the high idle condition to happen. Next reach in with you fingers and push on the throttle plates to see if they'll close more. If they do the idle may come down. I use a small amount of axle greese on the edges of the plates.

2. check the IAC (mounted on the RF of plenum) for contamination (carbon).
Do NOT clean it completely as it has a special grease on it.