Why does a eighty nine dodge dynasty runs for about three seconds then quits?

Hey Dude I had the same problem and after spending a lot of items I didn't need I found out it was the computer. I had just replaced it a year ago and didn't believe it went bad again, but I found one in a bone yard put it in and it started right up the reason it does that is because it thinks someone is trying to steal your car, its something programed into the computer its self.

Hey it could also be that your alarm horn and lights got cut off. And it's still going off. That is what happened to mine. I had to shut off the alarm before the car would run.