Hi, I'm new to this forum and I'm under a great deal of stress. I purchased my 2002 V6 mustang about a year ago and everything was running great until recently. The car now shakes uncontrollably and backfires a lot. It turns on fine but then it starts to shake and it smells terribly of smoke. We took it to various mechanics and they keep running the computer thing and they've had us change over 5 sensors and the fuel pump and the air filter and the serpentine belt and so on and the car continues the same. I am terribly frustrated and would like to know if anyone has any advice in the matter to what might be going on. Thank you.:weeps