I know what you mean about it been a pain to change plugs mate it annoys the life out of me too it’s one of the main reasons for wanting a ffim for my NA-T
Are you getting power to the injectors test for this and get a metal bar put it against injectors and get somebody to turn on ignition and crank you should hear clicking usually as they fire
have you checked harness main plug at firewall to ecu and all your earths there’s some under the intake manifold and one near rear of block and transmit ion to the firewall and another opposite side I think
fingers crossed for you buddy