Codes P0137, P0131 and P0304, stalls, rough idle, misfires?

I have gas in my oil my car stalls has rough idle misfires it throws codes P0137, P0131, P0304. I have changed O2 sensor, MAP sensor, upstream and downstream stream sensors, spark plugs, and coil packs. I have done fuel assembly replacement. I have changed injectors. I have changed the power control module. I also changed oil pressure sensor because it needed it, but after doing these things it still throws the same codes and acts the same. I don't know what else to do a local mechanic shop charged me $1,000.00 to fix it and that's after I done all the other stuff to the car and they just must have seen an easy target thinking because I'm a girl. I don't know about cars because they have it back doing the same thing on, and Engine light has been on for about a month now it's blinking. Please help. Oh, and I had oil in my power control module when I took it off and on my spark plugs.