5.7L vortec (96) missing after heats up and been shut off

DiddlesDiddles Member Posts: 2
edited July 2019 in Chevrolet
I've changed plugs, wires, cap and rotor. codes read random misfire, o2 and cat? If start up after been sitting for hours and cold runs fine till I shut it off and go to drive it again before time to totally cool?
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