Rough idle, runs when I push on gas but try's to die when I put it in gear

I did that and still nothing. I put a fuel pressure regulator on it and now it won’t even start

Hi, sorry for the delay. The fuel pressure regulator is a pretty in depth job, so there are lots of places where mistakes can be made. If you didn't replace gaskets and clean thoroughly while you were in there, it is most likely you can't get it to start due to severe vacuum leaks. Really, that is not a job I would recommend for most to do at home. I recommend tracing back through every step to ensure that things were removed, replaced, and installed correctly, and that everything went back in clean and with new seals. That being said, it would surprise me if this was a fuel issue. Demand for fuel is low when the engine is at idle, but high anytime you press the accelerator pedal. If it runs well when pressing the accelerator, it is likely not a fuel issue. Scan for trouble codes as well. The engine control module may have a story to tell.