oil and idle problem

the problem:

my car this morning started fine and everything, but as soon as i started driving it and stoped at the stop sign my RPM’s dropped all the way down and my car turned off. I though nothing of it because it happened before. So i go to start my car again and take off. At the next light the same thing happens, my RPM’s drop all the way to 0 and my car turns off. I start my car again and my oil light comes on now. The thing is i just got an oil change and that PCV valve and also changed the oil pan and gaskets because it was leaking before. I’m wondring if it has anything to do with a vaccum hose or my oil pump? Please fellas help me out o need my car for the next Cali meet:argh: