ok guys my wifes dad has a 96 f250 psd zf5 4x4 190000 mi. we took his truck and boat fishing fri. night, got to the lake backed down the ramp, shut the truck off, took off the tie downs, front hook put the plug in, i jumped in the truck to back it in and no start( batterys good and charged) cranked over just fine but no fire? we let it cool off, finally she starts, we fish all night get back to the ramp she starts like nothing was wrong. today he calls me from home depot truck wont start, a buddy of his is there and they hook a strap to it pull it 5 feet and she fires right up? thats the part that stumps me cranks over no start, pull it 5 feet dump the clutch and she fires right up? any help guys? thanks in advance.