My dad just got a 03 F350 166xxx miles 100% stock and is having cold start issues and can't really find any answers in a search so I'm asking. The truck will crank over fast and even sound like a cylinder or more is trying to hit and gets smoke out of tail pipe but will not start if you dont plug it in which led me down the glow plug path but the glow plugs all ohm to around .7, glow plug relay is new and working and new batteries, new fuel filter even took valve covers off and ran continuity check on all the glow plug wires. I also tried unplugging the icp and cranking with no luck because that seemed to be a common thing to try in my searches. Also could be unrelated I dont know but it has no power until it gets up to temperature. What am I missing I got cranking speed air and fuel but wouldn't start with out plugging in.