Does a 29-year-old, single man who works with his car to cover his expenses and has minor debts deserve zakat, given that he sometimes finds his daily sustenance and sometimes does not?

You are permitted to take from the Zakat if you do not find sufficient means to cover your basic expenses, or if you have an immediate debt that you cannot repay. Your ability to earn, despite the absence of work, does not prevent the permissibility of you taking from the Zakat.