I have a 2000 Ranger xlt w/4.0l engine and when I start it (hot or cold) it idles up to about 3000 rpm's for about 10 - 15 seconds and then goes back down to a normal idle and then runs fine. Any suggestions??? Not sure where to start looking first.

 

Any codes or Check engine light? I would also check the throttle body for dirt and the IAC.

 

No engine light and I have no way of checking for codes. The truck runs great otherwise.

 

Found it! Mice built a nest in my air cleaner housing. I don't know how the truck ran at all. It was jammed tight with insulation and hickery nuts.

 

hahahahahahahah mice...

that would do it

 

Wow, now there is something you don't hear everyday. Glad tro see you got ot correected.