Check to see if the long crank only seems to happen when the truck sits overnight, in which case it might be bleed down of the residual fuel pressure. If you have access to a fuel pressure gauge, hook it up overnight and check it in the morning. If it happens to be bleed down, it could either be the one way valve in the fuel pump, or the injectors... which washes out the oil from the cylinder rings causing low compression at first start.

This is just one of the possible causes, but one people tend to forget about. If it is the fuel pump bleeding down, turning the key on for a few seconds a couple times before starting it to prime the system would probably help. If its an injector bleeding down, it will usually give you a misfire fault stored for the affected cylinder.

But like I said, this is just one of the possible causes that could be looked at. Happy hunting!

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