06 f-250 FX4 with the 6.0, over the past few days I've been having problems starting it (go to turn key and nothing but I have full power, cycle key about 5 times and it will fire like nothing is wrong. Starting but keeps cranking and cranking (like its starving for fuel) and eventually dies or will turn over and just stall.) I had the batteries, starter and alternator tested and they all checked fine. I replaced the key switch but that didn't help with the key issue.
Now when I cycle the key the glow plug light stays on way long after the truck has been started.