Civic EG

d16z6 starts up fine, go maybe 5 mins just to the store and then go to leave it will start then bog down and die..go to try it again and just doesnt want to fire... cranks and cranks..even when waiting a min for the fuel pump to kick on it still doesnt fire..then maybe 5 mins later after it cools just a lil it starts fine ...idk what it is...replaced fuel filter, pressure reg checked hoses over and over again

Any CEL's?

most likely fuel pump .

once its been warmed up it wont function properly thats why when you cool down the car starts up again .