For the first, yes you will have to pull the plenum, but it's an easy job. Try AutoPartsGiant.com, I've had good luck finding Ford parts there.
Can't really help you and the second... I'd fix the IMRC thing first, just to be sure the second problem isn't being caused by the first, thenI'd go for the sensor... just because it doesn't squeek doesn't mean it isn't bad. Did I have enough contractions there?
