00 Focus ZX3 5spd Idle Problem

My 00 Ford Focus is a Standard and has around 74,000 Miles on it. The Engin Started Idleing Anyware Between Normal and 3500 Rpms. Varys Randomly.
Some times its Around 2000 and somtimes it goes up to around 3500 any Ideas or Suggestions???

My Escort Zx2 did that the other day, Usually it was a sticking throttle plate. It happened about every year, this time it was the IAC.