I have a 2000 F350 and it was doing the same thing. It was very hard to start in the cold mornings. Very bad lope to it. Would take 5-8 times till she fired up. Talk to the local machanic and he said that I should replace the Glow plug relay. He said it was a cheap place to start. Went to Napa and bought a Glow plug relay for $70. Replaced it in my drivway in about 15 minutes and have not had a problem since. Works great. Starts right up in the cold mornings first try. you might want to try that before you pay Big $$ on new glow plugs. See if that works first. Hope this helps
Kyle
