You can't go wrong with a DieHard Gold. My car starts in 30 below weather after weeks of sitting.
I don't believe that's your father's problem, though. I'd do a tune up which includes replacing the PCV valve. A long crank and stumbling is a symptom of a bad PCV valve. There are other things to check, but that's where I would start. Reading the codes from the computer wouldn't hurt either.
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