High idle and shifting problems

[Panhead66]

Hi everyone. I am having issues with my 2000 explorer xls with the 4.0 ohv motor. I am getting a high idle (1100 rpm) when in park. When I drive it it goes to around 2500-3000 rpms before it shifts. From second to third it seems to slip quickly and shifts a little hard. Once I drive about 3 or more miles it doesn’t want to shift down and get a bad shutter. I have cleaned the throttle body, changed the tps, and can’t figure out what it could be. Any help would be appreciated...

 

[Mbrooks420]

Flashing OD light?
Leaking intake, or a vacuum issue can lead to too high of an idle.
Maybe the IAC valve as well, but I believe that mostly causes a low idle/stalling condition.

 

[Panhead66]

Flashing OD light?
Leaking intake, or a vacuum issue can lead to too high of an idle.
Maybe the IAC valve as well, but I believe that mostly causes a low idle/stalling condition.

Yes the over drive light starts flashing.

 

[Mbrooks420]

Sounds to me like it’s possibly skipping second gear. (Third shift in your transmission). If you get the transmission codes read it’ll point to something. Could have a broken band, or possibly something to do with the shift solenoids.