Fuel pump out???
 

Hi I have a 14 chevy zl1 that has been modified.. headers.. cats taken off. Cammed. Dyno tuned.. I am having a misfire somewhere and think it has something to do with the fuel pump.. any thoughts??

Welcome to the club
Connect a pressure gauge to fuel rail and observe PSI through RPM's.
If not steady, or falls off, fuel line restricted, clogged screen in tank, filter needs replacing, corroded connections for power, or a bad pump

fuel pump out can be a real pain, happened to me on my '22 SS and it turned out to be a faulty electrical connector on the fuel pump module, try checking that first if you haven't already.