Car idling at 4000 rpm in park, what could this be?
I have a 2004 Ford Escape, and I was driving it home from work and the brake seemed harder to push to stop, then as I was getting off the highway I took my feet off everything and it was going 50km without me hitting any pedals, then I got into my condo parking lot and parked my car in my spot put it in park and all of a sudden it's rmps just go from like 1 or 2 thousand to 4000. Anyone have any clue what this could be?
Hi so what about getting a car serviced when it needs it. As it is an old car it needs servicing just as much as new one. It all need spares being such an old car. So time to getting it seen to.
Faulty computer and it is RPM's
Take the IAC out and clean with carb cleaner, they will get carbon build up in them, DON't push or pull the plunger looking thing when it is out spray it good then spray a little W D 40 in it reinstall, you will have to unhook battery to clear computer, do this first install IAC plug the plugin back into it reconnect battery crank, let it idle a few minutes for computer to relearn IAC. 
I've seen carb cleaner ruin IAC valves. Use throttle body cleaner instead. Touching the two battery cable together after disconnecting them from the battery will discharge any electrical feedback in the system. Make sure all of you hoses and air filter bellows are not cracked of disconnected.
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