transmission control problem

What is your question?

Starting off, the trans. hesitates a few seconds and then jumps into low gear... Driving on the highway, it will suddenly jump into passing gear... I think it's a switch somewhere malfunctioning, or something to do with the vacuum ??????? Has anyone experienced this before ??? PS. I can put the selector in "N" and allow the engine to slow {at 55-or 60 MPH } to 2200 rpm or there about and put it back in drive and it"s usually ok....... Thank's John