Just bought this car about a week ago, seller told me car had a rough idle, but smooths out when reeves at a higher rpm. Which I had no problem with. Yesterday the check engine light went off, the check gas cap alert popped up and went away. I woke up to start it and it wouldn’t start, all lights radio and everything work perfect. And it sounds like it wants to start it just doesn’t catch and start up. The other night my friend brought a code reader and it did read P0300 and P0455. I’m just t a complete loss. Payed cash and I feel like I got shafted. PLEASE SOMEONE HELP. The worst part is I just moved here so I know no mechanics that would actually help me.