misfire p3000 after catalytic converter replace

[Magnacharged H2]

I havent had time to do much else on the truck , but did download the last freeze frame from my scanner. Engine light only comes on after it sits and idles. If I clear the code while driving it never comes on.
anyone read this Thanks

P0300 random misfire
fuel sys 1 OL
fuel sys 2 OL
calc load % 3.1
ect *c 71
stft b1 0.0
lift b1 8.6
stft b2 0.0
lift b2 14.1
map 42
eng rpm 708
veh speed 0
maf 8.78
tps 9.8