1999 7.3 having trouble starting. Starter chugs until it is essentially running. As soon as you get of the starter all action stops. We have borrowed parts from a running 7.3 side by side. ICP, IDM, changed out between trucks no change. New glow plugs and harnesses. Oil level, fuel level fine. Plug it in and it will start. Might take a couple shots of ether. Then start all day. Have video if anyone is interested.