If you get third then overdrive - before doing anything check the cable that runs from the throttle body to trans - make sure it moves freely all the way back and forth.
Then check at the trans - there should be a spring from the top lever to the bell or bracket to return it forward.

If this spring is broke or missing or the cable does not return forward it will give you high throttle pressure and shift late. It shouldn't skip second though but stranger things have happened.