engine misfire

[mashfloyd]

i have a 2020 chequered flag conveyable, on cold start all is good, however once engine is upto temp usually about 30 mins of driving , i get a misfire on cylinder 4.. OBD is give random misfire code and injector circuit high voltage .
i have changes the plugs and swapped ignition coils around but still same .. any ideas please or is the next step change the injector ?

[JonGreen]

Probably need to specify which engine you have, V8, V6 or I4?

[WhoKnows]

And which specific obd codes it is giving is likely to help those that know more than me