Hey guys i need help, my car has been sputtering while pressing on the gas, idle jumps around and it even stalls out on me sometimes. I actually would here a ping at times. This occurs in gear as well as in park.I have about 11,5000 miles on the car. Im guessing its the maf sensor so i replaced it with one from a junk yard. Unfortunately i think this part was bad to because it got worse. What should i do.

93Gxe