Just pulled another code from my computer any ideas on tackling this one?? Car also has P0300 code random misfire could these two code coinside with each other i just dont know what to do at an idle the car runs rough strong fuel smell from exhaust just rebuilt the motor inside out completely lost know cant get it to run right need help if u can provide would greatly appreciate all i can get

I'm not positive but that may mean there is a bad connection on one of your wires coming from your o2 on your header. Im pretty sure that one is considered Bank 1. Good luck, I'm sure somebody will be around shortly that knows the exact solution for you!