Re: iac ? whistle
Check the hose clamps on the intake hose and make sure it's seated all the way. Could also be the airbox lid, it can be a mofo to get on right. I broke a clip on mine once, had to put a bolt and nut on one corner to seal it. Ford must have predicted that would happen because they put handy-dandy bolt holes on the corners of the airbox.
'05 Sport Trac 4x4, L/S, torsion lift, extended shackles, 265's
'03 Taurus wagon, Silverstars, Yoko TRZ's
If you give a man a fish, he'll eat for a day. If you teach a man to fish, he'll sit in a boat and drink beer all day.