P0031,P0037,P0051,P0057. Please help!!! I have a jeep wk 5.7 hemi. The mechanic said it needed a complete tune up. After the tune up he called and said that wasn’t the problem. It was the PCM, so I sent the PCM off for repair. When I got the PCM back, I dropped it off. They called me an hour later, said it was done. I picked my jeep up but I still have a rough idle and check engine light on. Absolutely nothing has changed. I need help!! Ty.