So guys, I'm just trying to find a place to start for my camaro. So I bought it, it ran rough, took it to a mechanic, he says bad ECM is causing fuel injectors to stay open. So I go to pick it up and it won't start. I'm getting codes 34 and 43. Code 34 is MAP sensor, so I think that's why it ran rough. The code 43 is supposed to either be knock sensor or ESC. What should I do first?