Q: Oil leaked heavily out of my car while driving home while making a revved up noise.

We have not had this car long so I don't have a lot of history. It has had a burning oil smell and a leak since we've gotten it. It also has a miss that we havent tracked down.On the first rly cold day we've had I started the car cold barely got of of my works parking lot and the car shut off while driving. It ran fine after I restarted it. Later that night leaving work cold it did the same thing but now the engine sounded like the rpms were revved up, but they werent. When I got home and shut the car off I could hear the oil rapidly dripping from some where that didn't seem to me was coming from the oil pan. There was a steady trail down my driveway and up the street. My coworker also mentioned it was doing that when we left. My fiance replaced an o ring and changed the oil. I don't belive any has leaked out since it's been parked. When u start it the engine is still making that higher pitched noise so we have no drove it. Any suggestions would b greatly appreciated. Thank u.

My car has 200000 miles.
My car has an automatic transmission.