Why does transmission not go into drive unless i Rev engine and reverse works fine

What is your question?

Transmission reverse works , wont engage in drive u less you rev the engine. When driving on road it will come out of gear when you stop, unless i turn of OD, with OD off , it will stop and go just fine. Also noticed that when rolling down hill , the rpms go down, like its in neutral

What makes this problem better or worse?

i changed transmission range sensor and still same problem. Obd didn't pick up any codes

How long has your 2004 Ford Expedition had this problem?

few weeks