I just got to down to replacing the oxygen sensors, haven't put them in yet. The car is running rough and I now get an additional code of P301 (cylinder 1 misfire). Could this be caused by the oxygen sensors code P140 or is this likely a different issue?

Thanks,
Scott

1996 Concorde

 

Number 1 is missing plugs,wires,compression off,head ,valves,carbon on valves. The 02 is the control for all clys not just one.