I would recommend taking carl's advice and making sure everything is clean before anything else. Once you're sure the TB is clean, Fast idle almost always boils down to getting unmetered air from somewhere. I had a similar problem where the idle would scream on startup (2000-3000rpm) but then settle down to normal once the car warmed up. Finally after checking the isc, making sure all intake hoses are tight, capping all the vacuum lines etc etc......eventually I came to the conclusion that it was either a)the egr valve or b) the FIAV.

I picked up a cheap throttle body (without the isc) which is very easy because nobody seems to really want them without the isc and gave it a shot. It did indeed turn out to be a bad FIAV.

[ February 27, 2002: Message edited by: Gary Singletary ]