truck runs fine till the weather gets up to around 80 then truck wants to stall

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truck runs fine till the weather gets up to around 80 then truck wants to stall like it is not getting gas have replaced gas pump, filter, o2 sensor, vac hose, ecm, coils and still having the same problem?????? like I said it runs great when the outside temp is around 80 or so but when it get abouve that evpor lock??? any answers help