Ok I guess it all started when the guy was driving it and it shut off. He put a bunch of amazon stuff on it. I've replaced the cps,fuel pump and wiring harness. I fixed the stuck prv valve. I just scored a parts rzr 800 so now I have a extra ecu,factory injectors and another coil pack. To try. Compression was good. But the amazon parts are making me wonder. So I hope going back to factory parts will help. It turns over fine just huffs and puffs with occasional backfire. Im gonna put a new battery in it due to how it keeps going down.