2006 F450 6.0L: last year we had all injectors, FICM, & both batteries replaced. Last week, the truck was taking longer to start, 5-6 seconds each time. It usually cranks & starts w/in 1-2 seconds. Once it made a sound like you'd hear on your car when it's already running and you accidentally go to start it. There's no smoke or anything, everything else is fine. Any ideas? Starter going? If it is the starter, is there anyway to bypass should it crap out on the jobsite today?