My car will stall in hot weather, what could that be? on 1998 Lincoln Navigator

I have to let the car sit then after about 30 min it will restart...drives fine at night

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2 answers
Does it overheat? If so, replace thermostat or check coolant level. Need to know temp. of engine at stall and what it does when it stalls.
need more details on stalling issue to advise