Ok, So it has no problem going, no problem accelertaing or decelerating, and cranks right up after dieing. If i put it into neutral it doesnt Die. The only issue is that when i do stop, it dies. It runs great, no problem with oil pressure or over heating. I am thinking it may be running lean but I really have no idea. The Idle speed when in gear is around 6-700. If anybody has any ideas i would love to hear them. Its a 4.2 with Automatic trans. I changed the fuel filter and that's when it began to do this.