93' Oil Pressure Problem

Does anyone possibly know whats going on. when I start my car it does good for a little bit. but when i give it gas and the idle comes back down, so does the oil pressure. at that point it struggles to keep going and then dies. even after I get it to a warm temperature from running with out letting the idle drop. now theres oil in my car, its just under full on the dipstick. any helps appreciated thanks.