hard starting

I have an 95 chevy blazer with a v6 in it 4.0 i think the thing start no
wanting to start up last week check engine lite came on but by the time i
got to advanced auto parts the dang thing went out they checked no codes
check the egr it was ok. changed the fuel filter started little better.it
takes about a minute to start then check engine comes on then about 5
minutes later goes off. run and starts ok most of the day. until first
start up in the morning. any ideas out there

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