Or, depending upon the overall condition of a 15 year old truck, you can roll the dice on that. Some run original injectors unless a head copper seal leaks. Ciprian has over 770,000 miles on original injectors. If my engine fails on the 2006, a Ford Transit gasser is likely in my future. If the 2004 dies, the bones get picked before it goes to scrap.From what I’ve read on this forum 250,000 miles seems around the time that pulling the injectors and testing / rebuilding them is an expensive but possibly catastrophe avoiding practice.
A big FWIW on the above. I'm just some guy on the internet.
A thorough inspection can reveal the condition of most front end parts. Is tire wear good? If yes, things may not be terrible. My 2004 at 328,000+ has needed a tie rod end. I have used a grease needle to lube the balljoints on the 2004 and the 2006.
New shocks and struts will likely improve the ride.
vic