How are the batteries and alt? I had a similiar issue a few weeks ago and the truck wouldn't restart in the bank drive thru. Truck always seemed fine when warm but kinda long slow first starts. I had 74K when batts. and alt. died. Just a thought. Remember, it does take a lot to crank these trucks with glow plugs and all the crap going on. You could have just one bad battery as well. Good luck and hope you get it figured out.