BigBamBubbalo

Hey guys, I just bought my first car and as expected it needs a little works. It sort of slips when shift into 2nd gear (it's an automatic) it revs then catches it self. I have no idea what it could be. Also if the car is sitting there running, I can put light pressure on the gas pedal and when I let off the car sometimes stalls but usually starts idling low for a few second. Some one HELPPP! Thanks in Advance guys