I have a 1990 Ford Mustang Lx leaking oil blowing smoke HELP!!?

I have a 1990 Ford Mustang Lx and it is leaking oil blowing smoke out the exhaust and smoking under when the hood when i turn it of. Just yesterday, i i tried to reverse it and it reved up alot before i could reverse it, and now, it stalls when it is in drive, but the engine sounds just fine. please help!