OK, I have a Dodge Ram 2500 5.9 L 360 4x4. The issue I am having is when starting and idling. Sometimes when I try and start it, it will start cranking, then have an abrupt stop like it just locked up or something, then go back to cranking. Then when it turns over, it will only stay running with my foot on the gas, when i relese it, it idles down and stops running. I have replaced my fuel pump and its the same. Any suggestions?