I have a 2005 Ford F-250 6.0 with 115000 miles, after a cold start and running for 30 minutes, I will shut it off it will not start. It turns over fine. If I crank it for 2-3 minutes it will begain to "run-on" before finally starts but acts like it's not getting fuel. After it sits for several hours and cool down it will starts fine. I have not noticed any power loss, it runs fine,