Jroc21

I've been having issues with my car and replaced plugs,wires,belt and air filter and cleaners and fuel additives but my car still shakes when idling, as well as when I shift from 1st to second it hesitates or feels like it lacks something because it seems like it not getting enough of something and just wants to dog out and none of my lights are on so I can find a code and I'm also wondering if my computer board is working because some codes for other things I've replaced should come on.