I just installed the RC 440 injectors for my car alone with the stock injector plug since I fix the RC injector a bit to make it fit. I am wondering, is there any relay or else inside the plug that RC comes with to make it work with our car?? I found my A/F jumps up and down rapidly when I stay in the almost-the-same-throttle-percentage. Whoever knows it, please do share..

thanks

 

The plugs are just plugs. If you've got them to fit without hacking your loom then great.