Recently took my truck into the shop. My truck ran rough and sometimes wouldnt start. Then it got to the point where it wouldnt start and if I could get it to start it ran rough. Took it to a mechanic he fixed som grounds and then swapped out the pcm. It now starts, but blows bluish smoke. And runs rough at idle. Also, along with that my alternator stopped charging. What would cause this bluish smoke and how come my alternator all of a sudden stopped charging? Possible fusible link blown?