I have a 1999 Ford F250 Super Duty w/7.3 L V8 Diesel

I have a problem starting the truck when the tempature is below 40 Deg. I have had the battery checked out and there are ok. I have also had the fuel filter changed recently. And also the truck skips every once in a while. Can you please give me some ideas on what the problem is. Thanks


Glow plug problem, perhaps?