I was getting high idling while driving not while starting up found that the Trottle Sensor was bad again ,I had replaced the Trottle Position Sensor and Idle Control Valve back in March 2013 due to rebuilding just put everything new. I'm now getting a high idle when starting up after replacing Trottle sensor again. Would it be the Idle valve to again.
High Idle on start up on 1999 Ford Expedition
Possible vacuum leak.
agree with pushrod or tps is misadjusted
You may have a vacume leak causing the fast idle. Also have seen a stuck PCV valve cause this a few times.