Need help, I have replaced the plugs and coil pack, done leak down, compression test, swapped fuel injector, what else should I check? Engine light comes on after warm up. On diagnostic misfire resets constantly.

 

Welcome to CL.
How many miles are on it?
Check for codes? You need to know what the car thinks is the problem before throwing parts at it.

Make sure none of the coil wires or connectors are broken and that no varmints have eaten your wiring.
What brand coils and spark plugs did you use?