Truck runs great but have a P0300 and recently got P1133 ive changed the spark plugs, wires, cap, recently seen i was missing vaccum lines due to correded lines. I replaced the ones that seemed damaged. Could it be one of o2 bank sensors got damaged from running so rich? Service engine soon flashes when in operating temp.. Any help? Truck drives great ? Any lines i might of missed?

 

You need a scan tool to check O2 sensor operation. Needs to switch from rich to lean.