I know this is an old thread but solely for the purpose of people who actually search as I do, I want to add what my problem was and how it was fixed. Like the OP my car would start and run and then randomly sputter and die. It would start and then sputter and die, over and over again on random occasions it would stay running for a short trip but then the whole process would start over again. To make a long story short, the fuel pump would only activate when the starter was on. As soon as it was left in the on position the fuel pump would turn off, hence the sputtering and dying part. The cause of this was the contact in the Air Flow Meter. When the key is in the ON position the fuel pump will only stay running if there is air moving through the Air Flow Meter. A safety thing. I felt it was right to post on this thread because this is the thread that helped me solve my problem and hopefully this can help somebody else. I also wana post A link that I found that helped with everything http://www.atlanticz.ca/zclub/techtips/efisystem/280zfuelinjectionbook.pdf