So I bought a cleaner miata shell I swapped my engine from a clapped miata that ran mint before pulled, now, I got everything put back together it starts up and drives but i have a misfire on cylinder 4 after new spark plugs and wires it still does it, so i got a solenoid test light to test the injector wiring and all of them get a pulse except for cylinder number 4 I checked the wiring the best i could from the ecu to the injector and it seems fine, is there something im missing here? Please help!

 

You're gonna need to use a multimeter to confirm the injector 4 signal wire to the ECU has continuity. Any other method is just guesswork.